如何在android中只显示一次滑动图像
我在切换到图像的地方应用了查看寻呼机滑动,然后我保留了一个按钮,在那里它切换到另一个活动。下次打开时,它不应该显示滑动图像。它应该直接打开活动。如何操作?我使用了偏好,但我不知道在哪里实现 我的代码如下: MainActivity.java如何在android中只显示一次滑动图像,android,android-intent,android-fragments,android-preferences,page-fragments,Android,Android Intent,Android Fragments,Android Preferences,Page Fragments,我在切换到图像的地方应用了查看寻呼机滑动,然后我保留了一个按钮,在那里它切换到另一个活动。下次打开时,它不应该显示滑动图像。它应该直接打开活动。如何操作?我使用了偏好,但我不知道在哪里实现 我的代码如下: MainActivity.java public class MainActivity extends FragmentActivity { static final int ITEMS = 2; //here i am displaying two times of ImageFragmen
public class MainActivity extends FragmentActivity {
static final int ITEMS = 2; //here i am displaying two times of ImageFragment
MyAdapter mAdapter;
ViewPager mPager;
String status, city;
boolean proceed = true;
public static final String City = "city";
public static final String Activity = "activity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager) findViewById(R.id.pager);
status = preference.readString(getBaseContext(), preference.LOGGED_IN,
"");
city = preference.readString(this, preference.CITY, "");
if (city.equals("") || (city == null)) {
proceed = false;
}
if ((status == "") || (status == null)) {
status = "true";
preference.writeString(getBaseContext(), preference.LOGGED_IN,
status);
} else if ((status.equals("true") && (proceed))) {
Intent i = new Intent(MainActivity.this, MainActivity1.class);
i.putExtra("activity", "city");
startActivity(i);
finish();
}
mPager.setAdapter(mAdapter);
Button button = (Button) findViewById(R.id.first);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPager.setCurrentItem(0);
}
});
button = (Button) findViewById(R.id.last);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPager.setCurrentItem(ITEMS);
}
});
}
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
@Override
public int getCount() {
return ITEMS;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0: // Fragment # 0 - This will show image
return ImageFragment.init(position);
case 1: // Fragment # 1 - This will show image
return ImageFragment.init(position);
default:// Fragment # 2-9 - Will show list
return ImageFragment.init(position);
}
}
}
public class ImageFragment extends Fragment {
int fragVal;
Button imagev;
static ImageFragment init(int val) {
ImageFragment truitonFrag = new ImageFragment();
// Supply val input as an argument.
Bundle args = new Bundle();
args.putInt("val", val);
truitonFrag.setArguments(args);
return truitonFrag;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
fragVal = getArguments() != null ? getArguments().getInt("val") : 1;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View layoutView = inflater.inflate(R.layout.fragment_image, container,
false);
View tv = layoutView.findViewById(R.id.text);
imagev=(Button)layoutView.findViewById(R.id.imageView2);
imagev.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// here i am switching to another activity. when i open second time, this
// MainActivity1 to get displayed
Intent myIntent = new Intent(getActivity(), MainActivity1.class);
getActivity().startActivity(myIntent);
}
});
((TextView) tv).setText("Truiton Fragment #" + fragVal);
return layoutView;
}
}
ImageFragment.java
public class MainActivity extends FragmentActivity {
static final int ITEMS = 2; //here i am displaying two times of ImageFragment
MyAdapter mAdapter;
ViewPager mPager;
String status, city;
boolean proceed = true;
public static final String City = "city";
public static final String Activity = "activity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager) findViewById(R.id.pager);
status = preference.readString(getBaseContext(), preference.LOGGED_IN,
"");
city = preference.readString(this, preference.CITY, "");
if (city.equals("") || (city == null)) {
proceed = false;
}
if ((status == "") || (status == null)) {
status = "true";
preference.writeString(getBaseContext(), preference.LOGGED_IN,
status);
} else if ((status.equals("true") && (proceed))) {
Intent i = new Intent(MainActivity.this, MainActivity1.class);
i.putExtra("activity", "city");
startActivity(i);
finish();
}
mPager.setAdapter(mAdapter);
Button button = (Button) findViewById(R.id.first);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPager.setCurrentItem(0);
}
});
button = (Button) findViewById(R.id.last);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPager.setCurrentItem(ITEMS);
}
});
}
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
@Override
public int getCount() {
return ITEMS;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0: // Fragment # 0 - This will show image
return ImageFragment.init(position);
case 1: // Fragment # 1 - This will show image
return ImageFragment.init(position);
default:// Fragment # 2-9 - Will show list
return ImageFragment.init(position);
}
}
}
public class ImageFragment extends Fragment {
int fragVal;
Button imagev;
static ImageFragment init(int val) {
ImageFragment truitonFrag = new ImageFragment();
// Supply val input as an argument.
Bundle args = new Bundle();
args.putInt("val", val);
truitonFrag.setArguments(args);
return truitonFrag;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
fragVal = getArguments() != null ? getArguments().getInt("val") : 1;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View layoutView = inflater.inflate(R.layout.fragment_image, container,
false);
View tv = layoutView.findViewById(R.id.text);
imagev=(Button)layoutView.findViewById(R.id.imageView2);
imagev.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// here i am switching to another activity. when i open second time, this
// MainActivity1 to get displayed
Intent myIntent = new Intent(getActivity(), MainActivity1.class);
getActivity().startActivity(myIntent);
}
});
((TextView) tv).setText("Truiton Fragment #" + fragVal);
return layoutView;
}
}
MainActivity1.java
public class MainActivity1 extends Activity{
public static final String CITY = "city";
public static final String ACTIVITY = "activity";
String city,activity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main1);
city = preference.readString(this, preference.CITY, "");
Intent i = getIntent();
activity = i.getStringExtra(ACTIVITY);
}
}
但如果我第二次打开,它不会显示MainActivity1.java。一旦获得,它就会显示MainActivity。如何解决这个问题?请帮帮我。我的偏好代码在这里
提前谢谢。事实上,我不知道你那些花哨的字符串比较是用来。。。只需按照以下代码进行操作:
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
if(sp.getBoolean("first_start", true)){
//Setup everything for the first start, e.g. your ViewPager, Adapter etc.
//Set first_start = false
sp.edit().putBoolean("first_start", false).commit();
}
else{
//It's not the first start so go to the other Activity
Intent i = new Intent(MainActivity.this, MainActivity1.class);
i.putExtra("activity", "city");
startActivity(i);
finish();
}
直接在onCreate()方法中实现此代码。在另一个类中将一个布尔变量声明为静态变量。如果已经执行,则将其设置为false,否则将其设置为true。