嘿，我正在开发包含listview的应用程序，其中安装的应用程序填充了一些按钮，例如卸载。
public class MainActivity extends ListActivity {
PackageManager packageManager;
List<ApplicationInfo> applist;
Listadapter listadapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
packageManager = getPackageManager();
new LoadApplications().execute();
}
@Override
protected void onListItemClick(ListView l, View v, final int position, long id) {
super.onListItemClick(l, v, position, id);
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
dialogBuilder.setTitle("Choose option")
.setItems(R.array.options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0:
ApplicationInfo app = applist.get(position);
try {
Intent intent = packageManager.getLaunchIntentForPackage(app.packageName);
if (intent != null) {
startActivity(intent);
}
} catch (ActivityNotFoundException e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
}
break;
case 1:
ApplicationInfo app1 = applist.get(position);
Uri packageURI = Uri.parse("package:" + app1.packageName);
Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
startActivity(uninstallIntent);
applist.remove(listadapter.getItem(position));
listadapter.notifyDataSetChanged();
break;
case 2:
break;
}
}
});
dialogBuilder.setCancelable(true)
.show();
}
private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
ArrayList<ApplicationInfo> applist = new ArrayList<>();
for (ApplicationInfo info : list) {
try {
if (packageManager.getLaunchIntentForPackage(info.packageName) != null) {
applist.add(info);
}
} catch (Exception e) {
e.printStackTrace();
}
}
return applist;
}
private class LoadApplications extends AsyncTask<Void, Void, Void> {
private ProgressDialog progress = null;
@Override
protected Void doInBackground(Void... params) {
applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listadapter = new Listadapter(MainActivity.this, R.layout.list_item, applist);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
setListAdapter(listadapter);
progress.dismiss();
super.onPostExecute(aVoid);
}
@Override
protected void onPreExecute() {
progress = ProgressDialog.show(MainActivity.this, null, "loading apps info,,,");
super.onPreExecute();
}
}
@Override
protected void onPause() {
super.onPause();
listadapter.notifyDataSetInvalidated();
}
当我点击卸载时，应用程序位置会在卸载应用程序之前被删除。
这是strings.xml
<resources>
<string name="app_name">AppSharer</string>
<string-array name="options">
<item>Open App</item>
<item>uninstall</item>
</string-array>
</resources>
删除项目后，如何刷新列表视图。
谢谢!!!
答案 0 :(得分：0)
我从问题中得到的是，如果用户点击是以卸载，则必须遇到问题，但是从设置屏幕用户返回应用程序而不卸载它。对于这种情况，创建一个变量Boolean，如果用户在卸载时单击yes并将app包名称保存在实例级别的字符串变量中，则将为true;如果用户Boolean为true，则检查class check的resume方法，然后检查定义的包是否存在，如果它不存在则更新列表视图。请参考这个，我还添加了评论，以通知您所做的更改
public class MainActivity extends ListActivity {
PackageManager packageManager;
List<ApplicationInfo> applist;
Listadapter listadapter;
// add three variables
String packageName="";
boolean isUnInstallClicked;
int mPosition;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
packageManager = getPackageManager();
new LoadApplications().execute();
}
@Override
protected void onListItemClick(ListView l, View v, final int position, long id) {
super.onListItemClick(l, v, position, id);
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
dialogBuilder.setTitle("Choose option")
.setItems(R.array.options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0:
ApplicationInfo app = applist.get(position);
try {
Intent intent = packageManager.getLaunchIntentForPackage(app.packageName);
if (intent != null) {
startActivity(intent);
}
} catch (ActivityNotFoundException e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_LONG).show();
}
break;
case 1:
ApplicationInfo app1 = applist.get(position);
Uri packageURI = Uri.parse("package:" + app1.packageName);
Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
startActivity(uninstallIntent);
//remove applist.remove and notify from here and add it to on resume
packageName=app1.packageName;
isUnInstallClicked=true;
mPosition=position;
break;
case 2:
break;
}
}
});
dialogBuilder.setCancelable(true)
.show();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
// here check for whether unistall was clicked and was app unistalled
if(isUnInstallClicked && !appInstalledOrNot(packageName)){
//check whther app unistalled or not
applist.remove(listadapter.getItem(position));
listadapter.notifyDataSetChanged();
}
}
}
private boolean appInstalledOrNot(String uri) {
PackageManager pm = getPackageManager();
boolean app_installed;
try {
pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
app_installed = true;
}
catch (PackageManager.NameNotFoundException e) {
app_installed = false;
}
return app_installed;
}
private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
ArrayList<ApplicationInfo> applist = new ArrayList<>();
for (ApplicationInfo info : list) {
try {
if (packageManager.getLaunchIntentForPackage(info.packageName) != null) {
applist.add(info);
}
} catch (Exception e) {
e.printStackTrace();
}
}
return applist;
}
private class LoadApplications extends AsyncTask<Void, Void, Void> {
private ProgressDialog progress = null;
@Override
protected Void doInBackground(Void... params) {
applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
listadapter = new Listadapter(MainActivity.this, R.layout.list_item, applist);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
setListAdapter(listadapter);
progress.dismiss();
super.onPostExecute(aVoid);
}
@Override
protected void onPreExecute() {
progress = ProgressDialog.show(MainActivity.this, null, "loading apps info,,,");
super.onPreExecute();
}
}
@Override
protected void onPause() {
super.onPause();
listadapter.notifyDataSetInvalidated();