Android ViewPager、PagerAdapter和位图导致内存泄漏（OutOfMemoryError）

我已经建立了一个Android应用程序来显示天气数据（如果你想测试这个问题，我可以私下告诉你应用程序的名称）。用户可以从一天浏览到另一天，查看特定一天的天气

应用程序架构 我的应用程序使用片段（带有导航抽屉的单个MainActivity，它调用特定片段）

DayPagerFragment

使用具有无限页数（动态片段）的

ViewPager

。一页代表一天

DayPagerFragment

public class DayPagerFragment extends Fragment {

    private ViewPager mViewPager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_day, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mViewPager = (ViewPager) view.findViewById(R.id.pager);
        mViewPager.setOffscreenPageLimit(1);
        mViewPager.setAdapter(new DayAdapter(getChildFragmentManager()));
    }

    private static class DayAdapter extends FragmentStatePagerAdapter {

        public DayAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            return DayFragment.newInstance(null);
        }

        @Override
        public int getCount() {
            // I don't know the number to put here becauseI don't have 
            // a defined number of fragments (= dynamic fragments)
            return 1; 
        }

        @Override
        public int getItemPosition(Object object){
            return DayAdapter.POSITION_NONE;
        }

    }

    public void setCurrentPagerItemPrev() {
        //mViewPager.setCurrentItem(mViewPager.getCurrentItem() - 1);
        mAdapterViewPager.getRegisteredFragment(mViewPager.getCurrentItem() - 1);
    }

    public void setCurrentPagerItemNext() {
        //mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);
        mAdapterViewPager.getRegisteredFragment(mViewPager.getCurrentItem() + 1);
    }

}

public class DayFragment extends Fragment {

    private TextView mDay;
    private TextView mMonth;
    private Button mPrevDay;
    private Button mNextDay;
    private ImageView mCenter;
    private ImageView mLeft;
    private ImageView mRight;
    ...
    private DayRepository dayRepository;
    private Day currentDay;
    private Day prevDay;
    private Day nextDay;
    private DayUtil dayUtil;
    private DayUtil dayUtilPrev;
    private DayUtil dayUtilNext;
    private Calendar cal;
    private Calendar calPrev;
    private Calendar calNext;

    public static DayFragment newInstance(Calendar calendar) {
        DayFragment dayFragment = new DayFragment();

        Bundle args = new Bundle();
        args.putInt("year", calendar.get(Calendar.YEAR));
        args.putInt("month", calendar.get(Calendar.MONTH));
        args.putInt("day", calendar.get(Calendar.DAY_OF_MONTH));
        dayFragment.setArguments(args);

        return dayFragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_day_nested, container, false);

        mDay = (TextView) view.findViewById(R.id.textView_day);
        mMonth = (TextView) view.findViewById(R.id.textView_month);
        mCenter = (ImageView) view.findViewById(R.id.imageView_center); // Weather symbol (sun, cloud...) of D-Day
        mLeft = (ImageView) view.findViewById(R.id.imageView_left); // Weather symbol of D-1
        mRight = (ImageView) view.findViewById(R.id.imageView_right);  // Weather symbol of D-2

        //... get 6 others TextView/ImageView

        MyApplication app = (MyApplication) getActivity().getApplicationContext();

        // Get bundle args
        int day = getArguments().getInt("day");
        int month = getArguments().getInt("month");
        int year = getArguments().getInt("year");

        // Date
        this.cal = new GregorianCalendar(year, month, day);

        // Get prev/next day (for nav arrows)
        this.calPrev = (GregorianCalendar) this.cal.clone();
        this.calPrev.add(Calendar.DAY_OF_YEAR, -1);
        this.calNext = (GregorianCalendar) this.cal.clone();
        this.calNext.add(Calendar.DAY_OF_YEAR, 1);

        // Get data from database
        //...

        // Utils
        this.dayUtil = new DayUtil(currentDay, getActivity());
        this.dayUtilPrev = new DayUtil(this.prevDay, getActivity());
        this.dayUtilNext = new DayUtil(this.nextDay, getActivity());
        String dateCurrentDayName = FormatUtil.getDayName(app.getLocale()).format(this.cal.getTime());
        String dateCurrentDayNameCap = dateCurrentDayName.substring(0,1).toUpperCase() + dateCurrentDayName.substring(1);
        String dateCurrentMonthName = FormatUtil.getMonthName(month, app.getLocale());

        // Update UI
        //... lot of setText(...) using day object and utils
        mLeft.setImageResource(this.dayUtilPrev.getDrawable());
        mCenter.setImageResource(dayUtil.getDrawable());
        mRight.setImageResource(this.dayUtilNext.getDrawable());

        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Custom fonts
        MyApplication app = (MyApplication) getActivity().getApplication();
        ViewGroup vg = (ViewGroup)getActivity().getWindow().getDecorView();
        ViewUtil.setTypeFace(app.getTrebuchet(), vg);

        // Navigation between days
        mMoonPrevDay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                ((MainActivity)getActivity()).viewDay(calPrev);
            }
        });
        mMoonNextDay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ((MainActivity) getActivity()).viewDay(calNext);
            }
        });
    }

    // Never called!
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.w("com.example", "Fragment day destroyed");
    }

}

04-06 20:01:21.683  27008-27008/com.example D/dalvikvm﹕ GC_BEFORE_OOM freed 348K, 2% free 194444K/196608K, paused 93ms, total 93ms
04-06 20:01:21.683  27008-27008/com.example E/dalvikvm-heap﹕ Out of memory on a 1790260-byte allocation.
04-06 20:01:21.693  27008-27008/com.example E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example, PID: 27008
    java.lang.OutOfMemoryError
            at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
            at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587)
            at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:422)
            at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
            at android.content.res.Resources.loadDrawable(Resources.java:2110)
            at android.content.res.Resources.getDrawable(Resources.java:700)
            at android.widget.ImageView.resolveUri(ImageView.java:638)
            at android.widget.ImageView.setImageResource(ImageView.java:367)
            at com.example.ui.DayFragment.onCreateView(DayFragment.java:126) //...mLeft.setImageResource()
            at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
            at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
04-06 20:01:21.773  27008-27008/com.example I/dalvikvm-heap﹕ Clamp target GC heap from 197.480MB to 192.000MB
04-06 20:01:21.773  27008-27008/com.example D/dalvikvm﹕ GC_FOR_ALLOC freed 565K, 2% free 193932K/196608K, paused 73ms, total 73ms

第一次优化：使用

FragmentStatePagerAdapter

管理它，因为

FragmentPagerAdapter

不适合我使用/动态片段（将整个片段存储在内存中）

第二个选项：我已使用

setOffscreenPageLimit（1）

设置了当前页面两侧应保留的页数

DayFragment

public class DayPagerFragment extends Fragment {

    private ViewPager mViewPager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_day, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mViewPager = (ViewPager) view.findViewById(R.id.pager);
        mViewPager.setOffscreenPageLimit(1);
        mViewPager.setAdapter(new DayAdapter(getChildFragmentManager()));
    }

    private static class DayAdapter extends FragmentStatePagerAdapter {

        public DayAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            return DayFragment.newInstance(null);
        }

        @Override
        public int getCount() {
            // I don't know the number to put here becauseI don't have 
            // a defined number of fragments (= dynamic fragments)
            return 1; 
        }

        @Override
        public int getItemPosition(Object object){
            return DayAdapter.POSITION_NONE;
        }

    }

    public void setCurrentPagerItemPrev() {
        //mViewPager.setCurrentItem(mViewPager.getCurrentItem() - 1);
        mAdapterViewPager.getRegisteredFragment(mViewPager.getCurrentItem() - 1);
    }

    public void setCurrentPagerItemNext() {
        //mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);
        mAdapterViewPager.getRegisteredFragment(mViewPager.getCurrentItem() + 1);
    }

}

public class DayFragment extends Fragment {

    private TextView mDay;
    private TextView mMonth;
    private Button mPrevDay;
    private Button mNextDay;
    private ImageView mCenter;
    private ImageView mLeft;
    private ImageView mRight;
    ...
    private DayRepository dayRepository;
    private Day currentDay;
    private Day prevDay;
    private Day nextDay;
    private DayUtil dayUtil;
    private DayUtil dayUtilPrev;
    private DayUtil dayUtilNext;
    private Calendar cal;
    private Calendar calPrev;
    private Calendar calNext;

    public static DayFragment newInstance(Calendar calendar) {
        DayFragment dayFragment = new DayFragment();

        Bundle args = new Bundle();
        args.putInt("year", calendar.get(Calendar.YEAR));
        args.putInt("month", calendar.get(Calendar.MONTH));
        args.putInt("day", calendar.get(Calendar.DAY_OF_MONTH));
        dayFragment.setArguments(args);

        return dayFragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_day_nested, container, false);

        mDay = (TextView) view.findViewById(R.id.textView_day);
        mMonth = (TextView) view.findViewById(R.id.textView_month);
        mCenter = (ImageView) view.findViewById(R.id.imageView_center); // Weather symbol (sun, cloud...) of D-Day
        mLeft = (ImageView) view.findViewById(R.id.imageView_left); // Weather symbol of D-1
        mRight = (ImageView) view.findViewById(R.id.imageView_right);  // Weather symbol of D-2

        //... get 6 others TextView/ImageView

        MyApplication app = (MyApplication) getActivity().getApplicationContext();

        // Get bundle args
        int day = getArguments().getInt("day");
        int month = getArguments().getInt("month");
        int year = getArguments().getInt("year");

        // Date
        this.cal = new GregorianCalendar(year, month, day);

        // Get prev/next day (for nav arrows)
        this.calPrev = (GregorianCalendar) this.cal.clone();
        this.calPrev.add(Calendar.DAY_OF_YEAR, -1);
        this.calNext = (GregorianCalendar) this.cal.clone();
        this.calNext.add(Calendar.DAY_OF_YEAR, 1);

        // Get data from database
        //...

        // Utils
        this.dayUtil = new DayUtil(currentDay, getActivity());
        this.dayUtilPrev = new DayUtil(this.prevDay, getActivity());
        this.dayUtilNext = new DayUtil(this.nextDay, getActivity());
        String dateCurrentDayName = FormatUtil.getDayName(app.getLocale()).format(this.cal.getTime());
        String dateCurrentDayNameCap = dateCurrentDayName.substring(0,1).toUpperCase() + dateCurrentDayName.substring(1);
        String dateCurrentMonthName = FormatUtil.getMonthName(month, app.getLocale());

        // Update UI
        //... lot of setText(...) using day object and utils
        mLeft.setImageResource(this.dayUtilPrev.getDrawable());
        mCenter.setImageResource(dayUtil.getDrawable());
        mRight.setImageResource(this.dayUtilNext.getDrawable());

        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Custom fonts
        MyApplication app = (MyApplication) getActivity().getApplication();
        ViewGroup vg = (ViewGroup)getActivity().getWindow().getDecorView();
        ViewUtil.setTypeFace(app.getTrebuchet(), vg);

        // Navigation between days
        mMoonPrevDay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                ((MainActivity)getActivity()).viewDay(calPrev);
            }
        });
        mMoonNextDay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ((MainActivity) getActivity()).viewDay(calNext);
            }
        });
    }

    // Never called!
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.w("com.example", "Fragment day destroyed");
    }

}

04-06 20:01:21.683  27008-27008/com.example D/dalvikvm﹕ GC_BEFORE_OOM freed 348K, 2% free 194444K/196608K, paused 93ms, total 93ms
04-06 20:01:21.683  27008-27008/com.example E/dalvikvm-heap﹕ Out of memory on a 1790260-byte allocation.
04-06 20:01:21.693  27008-27008/com.example E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example, PID: 27008
    java.lang.OutOfMemoryError
            at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
            at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587)
            at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:422)
            at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
            at android.content.res.Resources.loadDrawable(Resources.java:2110)
            at android.content.res.Resources.getDrawable(Resources.java:700)
            at android.widget.ImageView.resolveUri(ImageView.java:638)
            at android.widget.ImageView.setImageResource(ImageView.java:367)
            at com.example.ui.DayFragment.onCreateView(DayFragment.java:126) //...mLeft.setImageResource()
            at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
            at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
04-06 20:01:21.773  27008-27008/com.example I/dalvikvm-heap﹕ Clamp target GC heap from 197.480MB to 192.000MB
04-06 20:01:21.773  27008-27008/com.example D/dalvikvm﹕ GC_FOR_ALLOC freed 565K, 2% free 193932K/196608K, paused 73ms, total 73ms

问题是： 我的应用程序非常图形化，因为每个页面都显示：

• 10文本框（内部文本根据日期变化）
• 4 ImageView（D-1、D-Day、D+1的天气符号）+另一个ImageView

当我浏览ViewPager页面时，我会很快（在+/-30页之后）摆脱内存错误

就好像这些片段没有从内存中释放出来。垃圾收集器没有像我预期的那样工作（我认为这是因为有东西引用了旧的片段）

Logcat

public class DayPagerFragment extends Fragment {

    private ViewPager mViewPager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_day, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mViewPager = (ViewPager) view.findViewById(R.id.pager);
        mViewPager.setOffscreenPageLimit(1);
        mViewPager.setAdapter(new DayAdapter(getChildFragmentManager()));
    }

    private static class DayAdapter extends FragmentStatePagerAdapter {

        public DayAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            return DayFragment.newInstance(null);
        }

        @Override
        public int getCount() {
            // I don't know the number to put here becauseI don't have 
            // a defined number of fragments (= dynamic fragments)
            return 1; 
        }

        @Override
        public int getItemPosition(Object object){
            return DayAdapter.POSITION_NONE;
        }

    }

    public void setCurrentPagerItemPrev() {
        //mViewPager.setCurrentItem(mViewPager.getCurrentItem() - 1);
        mAdapterViewPager.getRegisteredFragment(mViewPager.getCurrentItem() - 1);
    }

    public void setCurrentPagerItemNext() {
        //mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);
        mAdapterViewPager.getRegisteredFragment(mViewPager.getCurrentItem() + 1);
    }

}

public class DayFragment extends Fragment {

    private TextView mDay;
    private TextView mMonth;
    private Button mPrevDay;
    private Button mNextDay;
    private ImageView mCenter;
    private ImageView mLeft;
    private ImageView mRight;
    ...
    private DayRepository dayRepository;
    private Day currentDay;
    private Day prevDay;
    private Day nextDay;
    private DayUtil dayUtil;
    private DayUtil dayUtilPrev;
    private DayUtil dayUtilNext;
    private Calendar cal;
    private Calendar calPrev;
    private Calendar calNext;

    public static DayFragment newInstance(Calendar calendar) {
        DayFragment dayFragment = new DayFragment();

        Bundle args = new Bundle();
        args.putInt("year", calendar.get(Calendar.YEAR));
        args.putInt("month", calendar.get(Calendar.MONTH));
        args.putInt("day", calendar.get(Calendar.DAY_OF_MONTH));
        dayFragment.setArguments(args);

        return dayFragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_day_nested, container, false);

        mDay = (TextView) view.findViewById(R.id.textView_day);
        mMonth = (TextView) view.findViewById(R.id.textView_month);
        mCenter = (ImageView) view.findViewById(R.id.imageView_center); // Weather symbol (sun, cloud...) of D-Day
        mLeft = (ImageView) view.findViewById(R.id.imageView_left); // Weather symbol of D-1
        mRight = (ImageView) view.findViewById(R.id.imageView_right);  // Weather symbol of D-2

        //... get 6 others TextView/ImageView

        MyApplication app = (MyApplication) getActivity().getApplicationContext();

        // Get bundle args
        int day = getArguments().getInt("day");
        int month = getArguments().getInt("month");
        int year = getArguments().getInt("year");

        // Date
        this.cal = new GregorianCalendar(year, month, day);

        // Get prev/next day (for nav arrows)
        this.calPrev = (GregorianCalendar) this.cal.clone();
        this.calPrev.add(Calendar.DAY_OF_YEAR, -1);
        this.calNext = (GregorianCalendar) this.cal.clone();
        this.calNext.add(Calendar.DAY_OF_YEAR, 1);

        // Get data from database
        //...

        // Utils
        this.dayUtil = new DayUtil(currentDay, getActivity());
        this.dayUtilPrev = new DayUtil(this.prevDay, getActivity());
        this.dayUtilNext = new DayUtil(this.nextDay, getActivity());
        String dateCurrentDayName = FormatUtil.getDayName(app.getLocale()).format(this.cal.getTime());
        String dateCurrentDayNameCap = dateCurrentDayName.substring(0,1).toUpperCase() + dateCurrentDayName.substring(1);
        String dateCurrentMonthName = FormatUtil.getMonthName(month, app.getLocale());

        // Update UI
        //... lot of setText(...) using day object and utils
        mLeft.setImageResource(this.dayUtilPrev.getDrawable());
        mCenter.setImageResource(dayUtil.getDrawable());
        mRight.setImageResource(this.dayUtilNext.getDrawable());

        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Custom fonts
        MyApplication app = (MyApplication) getActivity().getApplication();
        ViewGroup vg = (ViewGroup)getActivity().getWindow().getDecorView();
        ViewUtil.setTypeFace(app.getTrebuchet(), vg);

        // Navigation between days
        mMoonPrevDay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                ((MainActivity)getActivity()).viewDay(calPrev);
            }
        });
        mMoonNextDay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ((MainActivity) getActivity()).viewDay(calNext);
            }
        });
    }

    // Never called!
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.w("com.example", "Fragment day destroyed");
    }

}

04-06 20:01:21.683  27008-27008/com.example D/dalvikvm﹕ GC_BEFORE_OOM freed 348K, 2% free 194444K/196608K, paused 93ms, total 93ms
04-06 20:01:21.683  27008-27008/com.example E/dalvikvm-heap﹕ Out of memory on a 1790260-byte allocation.
04-06 20:01:21.693  27008-27008/com.example E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example, PID: 27008
    java.lang.OutOfMemoryError
            at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
            at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587)
            at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:422)
            at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
            at android.content.res.Resources.loadDrawable(Resources.java:2110)
            at android.content.res.Resources.getDrawable(Resources.java:700)
            at android.widget.ImageView.resolveUri(ImageView.java:638)
            at android.widget.ImageView.setImageResource(ImageView.java:367)
            at com.example.ui.DayFragment.onCreateView(DayFragment.java:126) //...mLeft.setImageResource()
            at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
            at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
04-06 20:01:21.773  27008-27008/com.example I/dalvikvm-heap﹕ Clamp target GC heap from 197.480MB to 192.000MB
04-06 20:01:21.773  27008-27008/com.example D/dalvikvm﹕ GC_FOR_ALLOC freed 565K, 2% free 193932K/196608K, paused 73ms, total 73ms

我有内存泄漏，但我不知道为什么和在哪里。 我已经使用了EclipseMat（内存分析器），但我不知道去哪里看

你能帮我吗

---

编辑：对于load字体，我使用以下代码：

DayFragment.java

// Custom fonts
MyApplication app = (MyApplication) getActivity().getApplication();
ViewGroup vg = (ViewGroup)getActivity().getWindow().getDecorView();
ViewUtil.setTypeFace(app.getTrebuchet(), vg);

public Typeface getTrebuchet() {
    if (trebuchet == null){
        trebuchet = Typeface.createFromAsset(getAssets(), Consts.PATH_TYPEFACE_TREBUCHET);
    }
    return trebuchet;
}

MyApplication.java

// Custom fonts
MyApplication app = (MyApplication) getActivity().getApplication();
ViewGroup vg = (ViewGroup)getActivity().getWindow().getDecorView();
ViewUtil.setTypeFace(app.getTrebuchet(), vg);

public Typeface getTrebuchet() {
    if (trebuchet == null){
        trebuchet = Typeface.createFromAsset(getAssets(), Consts.PATH_TYPEFACE_TREBUCHET);
    }
    return trebuchet;
}

我的DDM显示内存泄漏：

---

编辑2：重要

我在应用程序中使用导航抽屉，它由我唯一的活动

main活动
处理。导航抽屉使用片段（而不是活动）

这就是为什么
DayPagerFragment
从
片段扩展而来（而不是从
片段活动或
活动扩展而来）

要在两天之间刷卡，用户必须触摸两个按钮（上一个/下一个）。我在
DayFragment
中的这些按钮上使用
setOnClickListener
（请参阅我更新的代码）

问题是我调用了
（（MainActivity）getActivity（））.viewDay（calPrev）

main活动

public class MainActivity extends ActionBarActivity implements NavigationDrawerFragment.NavigationDrawerCallbacks {

    private NavigationDrawerFragment mNavigationDrawerFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        // Set up the navigation drawer
        mNavigationDrawerFragment.setUp(R.id.navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout));
    }
    ...
    public void viewDay(Calendar calendar) {
        DayFragment dayFragment = DayFragment.newInstance(calendar); // The problem is here I think !
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction()
                .setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out)
                .replace(R.id.container, dayFragment)
                .addToBackStack(null)
                .commit();
    }

}

所以。。。我认为，因为每次我实例化一个新片段时，
ViewPager
无法完成他的工作！而
main活动
在每个片段上保留一个引用：这就是垃圾收集器不释放内存的原因

现在：

我不知道我的理论是否正确
如何纠正这一点？如何从
setOnClickListener
调用
setCurrentPagerItemPrev
和
setCurrentPagerItemNext
方法（请参见
DayPagerFragment
中的我的更新代码）
注意：我使用
mAdapterViewPager.getRegisteredFragment（）
而不是
mViewPager.setCurrentItem
，因为我的
DayAdapter
扩展自
SmartFragmentStatePagerAdapter
，但它是相同的。
我之前在我的应用程序中遇到了类似的问题。对我有效的解决方案是让适配器实现SmartFragmentStatePagerAdapter。
我看了一下，首先想到的是没有人真正调用
destroyItem（）
。您可能应该自己做。
使用您提供的代码，事情看起来不错，但有一种方法我建议您仔细检查：

ViewUtil.setTypeFace(app.getTrebuchet(), vg);

使用自定义字体时要小心，因为它可能会导致内存泄漏。您可以阅读这两个主题以了解更多详细信息和解决方案：



尝试使用填充图像视图，而不是默认方法。这个库负责内存，缓存图像等等。你的问题可能在于

mLeft.setImageResource(this.dayUtilPrev.getDrawable());
mCenter.setImageResource(dayUtil.getDrawable());
mRight.setImageResource(this.dayUtilNext.getDrawable());

每次调用新片段时都会调用这些函数，它们使用了大量位图解码函数，如

位于android.graphics.BitmapFactory.NativeDecodeset（本机方法）
位于android.graphics.BitmapFactory.decodeStream（BitmapFactory.java:587）
位于android.graphics.BitmapFactory.decodeResourceStream（BitmapFactory.java:422）
位于android.graphics.drawable.drawable.createFromResourceStream（drawable.java:840）
位于android.content.res.Resources.loadDrawable（Resources.java:2110）

如果处理不当，这些将在notime中填满您的内存
您已将intent filter MAIN添加到启动活动中。它结束，执行所有繁重工作的下一个线程（MainActivity）具有默认优先级（0）。
Android活动优先级可以从0到1000。除此之外，我还将Android:largeHeap添加到您的清单中

此外，您还可以使用意图过滤器MAIN创建两个活动。
按如下方式更新您的清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example" >

    <uses-sdk
       android:minSdkVersion="11"
       android:targetSdkVersion="19" />

    <uses-permission ...>

    <supports-screens
       android:smallScreens="false"
       android:normalScreens="true"
       android:largeScreens="true"
       android:xlargeScreens="true"
       android:anyDensity="true" />

    <application
       android:name="com.example.MyApplication"
       android:largeHeap="true"
       android:allowBackup="true"
       android:icon="@drawable/ic_launcher"
       android:label="@string/app_name">

        <!-- ACTIVITIES -->
        <activity
           android:name="com.example.ui.SplashActivity"
           android:label="@string/app_name"
           android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
           android:name="com.example.ui.MainActivity"
           android:screenOrientation="portrait"
           android:label="@string/app_name" 
           android:priority:"900">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

        <!-- ROBOSPICE SERVICES -->
        <service
           android:name="com.example.network.CalendarSpiceService"
           android:exported="false" />

    </application>

</manifest>

您需要在这里检查两件事：图像和字体

图像会占用大量内存，因此您需要做一些工作来快速释放它们。我使用了下面的代码来帮助清理我的内存，它删除了有助于更快清理的引用

此外，在短时间内加载许多高质量图像可能会导致错误，因为Android的堆空间增长有点慢。请参阅我的答案：。您可能需要在清单文件中设置android:largeHeap=“true”，但只有在优化图像和字体后才可以这样做

使用DDMS堆视图检查内存是否保持了某个级别，也就是说