Android 滚动列表视图时在后台复制
我使用的是自定义列表视图,运行应用程序后,一切正常,但在滚动列表时,视图变得混乱。我粘贴了屏幕截图,然后是下面的代码 我怎样才能解决这个问题 初始屏幕:Android 滚动列表视图时在后台复制,android,android-layout,android-listview,android-fragments,Android,Android Layout,Android Listview,Android Fragments,我使用的是自定义列表视图,运行应用程序后,一切正常,但在滚动列表时,视图变得混乱。我粘贴了屏幕截图,然后是下面的代码 我怎样才能解决这个问题 初始屏幕: import java.util.ArrayList; import android.content.Context; import android.graphics.Typeface; import android.media.MediaPlayer; import android.os.Bundle; import android.sup
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Typeface;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class MyList extends Fragment {
ListView list;
MediaPlayer mp;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedinstanceState)
{
mp=MediaPlayer.create(getActivity(), R.raw.wave1);
return inflater.inflate(R.layout.mylistview, container, false);
}
@Override
public void onStart() {
super.onStart();
list=(ListView)getView().findViewById(R.id.listView1);
list.setAdapter(new MyListAdapter(getActivity()));
list.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3)
{
switch(position)
{
case 0:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave1);
mp.start();
break;
case 1:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave2);
mp.start();
break;
case 2:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave3);
mp.start();
break;
case 3:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave4);
mp.start();
break;
case 4:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave5);
mp.start();
break;
}
}
});
}
}
class MyListAdapter extends BaseAdapter
{
ArrayList<SingleRow> list;
Context context;
MyListAdapter(Context c)
{
context=c;
list=new ArrayList<SingleRow>();
// Resources res=c.getResources();
// String[] text=res.getStringArray(R.array.text);
int[] images={R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
};
for(int i=0;i<19;i++)
{
list.add(new SingleRow(images[i]));
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row1=inflater.inflate(R.layout.mylist_rows, parent, false);
TextView text=(TextView)row1.findViewById(R.id.textView1);
ImageView image=(ImageView)row1.findViewById(R.id.imageView1);
SingleRow temp=list.get(position);
text.setText(temp.description);
image.setImageResource(temp.image);
Typeface font = Typeface.createFromAsset(text.getContext().getAssets(), "fonts/OpenSans.ttf");
text.setTypeface(font);
return row1;
}
class SingleRow
{
String description;
int image;
SingleRow( int image)
{
//this.description=description;
this.image=image;
}
}
}
import java.util.ArrayList;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class MainActivity extends FragmentActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_navigation_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
displayView(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
Fragment fragment = null;
// update the main content by replacing fragments
switch (position) {
case 0:
fragment = new MyList();
break;
}
if (fragment != null) {
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
滚动后和滚动时:
MyList.java:
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Typeface;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class MyList extends Fragment {
ListView list;
MediaPlayer mp;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedinstanceState)
{
mp=MediaPlayer.create(getActivity(), R.raw.wave1);
return inflater.inflate(R.layout.mylistview, container, false);
}
@Override
public void onStart() {
super.onStart();
list=(ListView)getView().findViewById(R.id.listView1);
list.setAdapter(new MyListAdapter(getActivity()));
list.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3)
{
switch(position)
{
case 0:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave1);
mp.start();
break;
case 1:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave2);
mp.start();
break;
case 2:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave3);
mp.start();
break;
case 3:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave4);
mp.start();
break;
case 4:
mp.release();
mp=MediaPlayer.create(getActivity(), R.raw.wave5);
mp.start();
break;
}
}
});
}
}
class MyListAdapter extends BaseAdapter
{
ArrayList<SingleRow> list;
Context context;
MyListAdapter(Context c)
{
context=c;
list=new ArrayList<SingleRow>();
// Resources res=c.getResources();
// String[] text=res.getStringArray(R.array.text);
int[] images={R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
R.drawable.ic_launcher,
};
for(int i=0;i<19;i++)
{
list.add(new SingleRow(images[i]));
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row1=inflater.inflate(R.layout.mylist_rows, parent, false);
TextView text=(TextView)row1.findViewById(R.id.textView1);
ImageView image=(ImageView)row1.findViewById(R.id.imageView1);
SingleRow temp=list.get(position);
text.setText(temp.description);
image.setImageResource(temp.image);
Typeface font = Typeface.createFromAsset(text.getContext().getAssets(), "fonts/OpenSans.ttf");
text.setTypeface(font);
return row1;
}
class SingleRow
{
String description;
int image;
SingleRow( int image)
{
//this.description=description;
this.image=image;
}
}
}
import java.util.ArrayList;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class MainActivity extends FragmentActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_navigation_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
displayView(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
Fragment fragment = null;
// update the main content by replacing fragments
switch (position) {
case 0:
fragment = new MyList();
break;
}
if (fragment != null) {
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
import java.util.ArrayList;
导入android.content.Context;
导入android.graphics.Typeface;
导入android.media.MediaPlayer;
导入android.os.Bundle;
导入android.support.v4.app.Fragment;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.AdapterView;
导入android.widget.AdapterView.OnItemClickListener;
导入android.widget.BaseAdapter;
导入android.widget.ImageView;
导入android.widget.ListView;
导入android.widget.TextView;
公共类MyList扩展了片段{
列表视图列表;
MediaPlayer mp;
@凌驾
CreateView上的公共视图(布局、充气机、视图组容器、捆绑包保存状态)
{
mp=MediaPlayer.create(getActivity(),R.raw.wave1);
返回充气机。充气(R.layout.mylistview,容器,假);
}
@凌驾
public void onStart(){
super.onStart();
list=(ListView)getView().findViewById(R.id.listView1);
setAdapter(新的MyListAdapter(getActivity());
list.setOnItemClickListener(新的OnItemClickListener(){
@凌驾
公共单击(适配器视图arg0,视图arg1,内部位置,
长arg3)
{
开关(位置)
{
案例0:
mp.release();
mp=MediaPlayer.create(getActivity(),R.raw.wave1);
mp.start();
打破
案例1:
mp.release();
mp=MediaPlayer.create(getActivity(),R.raw.wave2);
mp.start();
打破
案例2:
mp.release();
mp=MediaPlayer.create(getActivity(),R.raw.wave3);
mp.start();
打破
案例3:
mp.release();
mp=MediaPlayer.create(getActivity(),R.raw.wave4);
mp.start();
打破
案例4:
mp.release();
mp=MediaPlayer.create(getActivity(),R.raw.wave5);
mp.start();
打破
}
}
});
}
}
类MyListAdapter扩展了BaseAdapter
{
数组列表;
语境;
MyListAdapter(上下文c)
{
上下文=c;
列表=新的ArrayList();
//Resources res=c.getResources();
//String[]text=res.getStringArray(R.array.text);
int[]images={R.drawable.ic_启动器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
R.drawable.ic_发射器,
};
对于(inti=0;i更新您的getView()
方法,它将工作得更快
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row1 = null;
if(convertView == null){
LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row1=inflater.inflate(R.layout.mylist_rows, parent, false);
}else{
row1 = convertView;
}
TextView text=(TextView)row1.findViewById(R.id.textView1);
ImageView image=(ImageView)row1.findViewById(R.id.imageView1);
SingleRow temp=list.get(position);
text.setText(temp.description);
image.setImageResource(temp.image);
Typeface font = Typeface.createFromAsset(text.getContext().getAssets(), "fonts/OpenSans.ttf");
text.setTypeface(font);
return row1;
}
此外,您还可以优化某些内容:
1如果图像始终相同,则可以将代码放入if
块
if(convertView == null){
LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row1=inflater.inflate(R.layout.mylist_rows, parent, false);
ImageView image=(ImageView)row1.findViewById(R.id.imageView1);
SingleRow temp=list.get(position);
image.setImageResource(temp.image);
}else{
if(convertView == null){
// inflating...
TextView text=(TextView)row1.findViewById(R.id.textView1);
Typeface font = Typeface.createFromAsset(text.getContext().getAssets(), "fonts/OpenSans.ttf");
text.setTypeface(font);
}else{
2如果您的字体始终不变,您也可以将其置于if
块中
if(convertView == null){
LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row1=inflater.inflate(R.layout.mylist_rows, parent, false);
ImageView image=(ImageView)row1.findViewById(R.id.imageView1);
SingleRow temp=list.get(position);
image.setImageResource(temp.image);
}else{
if(convertView == null){
// inflating...
TextView text=(TextView)row1.findViewById(R.id.textView1);
Typeface font = Typeface.createFromAsset(text.getContext().getAssets(), "fonts/OpenSans.ttf");
text.setTypeface(font);
}else{
试一试
修改getView():
如果它不起作用,请告诉我。已解决。原来我有两个片段声明。一个标记声明位于activitymain.xml中,另一个片段事务声明位于MainActivity.java中。根据可以在其中任何一个中声明片段,但不能同时在两个中声明。这就是为什么我得到了双重声明视图。发布承载此片段的活动代码。当然,我马上发布。将标记设置为convertview。我建议阅读此优秀答案,以更好地了解ListView的工作原理:您的活动布局xml中是否有片段?您是否也可以发布它?谢谢Roman。我尝试了此代码,但在“convertView=null"表示类型不匹配:无法从视图转换为布尔值。此外,图像将保持不变,但每个列表项上的文本将不同。抱歉,请替换为convertView==null。是否有其他方法可以修复此问题?我尝试了您共享的代码。应用程序因空指针而崩溃。但是,在运行应用程序之前,编译器警告convertView.setTag(第1行)作为“空指针访问:变量convertView只能在此位置为空”更改:View row1=Null;
toSingleRow row1=new SingleRow();
在new SingleRow()上得到红线,表示“构造函数mylistapter.SingleRow()未定义”。第1行使用的所有地方都有红线。