我正在为孩子们开发一个应用程序，其中我已经显示了所有应用程序的网格视图，这些应用程序由父母在孩子们的地方添加并具有适当的锁定功能，因此孩子无法退出应用程序。我成功地做到了这一切。但是我的一个锁定功能是电源按钮长按是有问题的。它在主要活动中正常工作，我在gridView中列出了所有添加的应用程序。但是当用户点击gridView中的任何应用程序项目时，我的长动力按下事件不起作用。当孩子按住长按电源按钮时，我不想显示系统对话框。我搜索了很多，尝试了很多东西，但没有任何作用。我使用this作为参考来源 以下是我的代码： （各种帮助表示赞赏）
mainactivity.java：
public class Teen4Activity extends Activity implements AdapterView.OnItemClickListener
{
private PackageManager packageManager = null;
private List<ApplicationInfo> applist = null;
private AppInfoAdapter listadaptor = null;
GridView gridview;
private Button hiddenExitButton;
dbHelper myDb;
ArrayList<ApplicationInfo> arrayList;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD); //for short power press
//for disabling status bar
WindowManager manager = ((WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE));
WindowManager.LayoutParams localLayoutParams = new WindowManager.LayoutParams();
localLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;
localLayoutParams.gravity = Gravity.TOP;
localLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|
// this is to enable the notification to recieve touch events
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
// Draws over status bar
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
localLayoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
localLayoutParams.height = (int) (50 * getResources().getDisplayMetrics().scaledDensity);
localLayoutParams.format = PixelFormat.TRANSPARENT;
customViewGroup view = new customViewGroup(this);
manager.addView(view, localLayoutParams);
setContentView(R.layout.activity_teen4);
// every time someone enters the kiosk mode, set the flag true
PrefUtils.setKioskModeActive(true, getApplicationContext());
Toast.makeText(getApplicationContext(), "Device Locked!", Toast.LENGTH_LONG).show();
gridview = (GridView) findViewById(R.id.gridview);
hiddenExitButton = (Button) findViewById(R.id.button5);
hiddenExitButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Break out!
PrefUtils.setKioskModeActive(false, getApplicationContext());
Toast.makeText(getApplicationContext(),"You can leave the app now!", Toast.LENGTH_SHORT).show();
finish();
}
});
myDb=new dbHelper(this); // getting the added apps from database
ArrayList<String> columnArray1 = new ArrayList<String>();
Cursor res=myDb.getAllData();
if(res.getCount()==0)
{
//showing error message for no data
showMessage("Error","First Add Apps to Teens Place");
return;
}
StringBuffer buffer=new StringBuffer();
while(res.moveToNext())
{
buffer.append("APPS :"+res.getString(0)+"\n");
columnArray1.add(res.getString(0));
}
//showMessage("Data",buffer.toString());
Gson gson = new GsonBuilder().excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC).serializeNulls().create();
String json =columnArray1.toString() ;
Type type = new TypeToken<ArrayList<ApplicationInfo>>() {}.getType();
arrayList = gson.fromJson(json, type);
packageManager = getPackageManager();
new LoadApplications().execute();
}
@Override
public void onBackPressed() {
// nothing to do here
// … really
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if(!hasFocus) {
// Close every kind of system dialog
Intent closeDialog = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
sendBroadcast(closeDialog);
}
}
private class LoadApplications extends AsyncTask<Void, Void, Void>
{
@Override
protected Void doInBackground(Void... params)
{
applist = arrayList;
Log.d("list size", String.valueOf(applist.size()));
listadaptor = new AppInfoAdapter(Teen4Activity.this, R.layout.layout_appinfo, applist);
System.out.println("adapter="+listadaptor);
return null;
}
@Override
protected void onCancelled() {
super.onCancelled();
}
@Override
protected void onPostExecute(Void result)
{
gridview.setAdapter(listadaptor);
gridview.setOnItemClickListener(Teen4Activity.this);
super.onPostExecute(result);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
ApplicationInfo app = applist.get(position);
try {
Intent intent = packageManager.getLaunchIntentForPackage(app.packageName);
if (null != intent)
{
startActivity(intent);
}
} catch (ActivityNotFoundException e) {
Toast.makeText(Teen4Activity.this, e.getMessage(), Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(Teen4Activity.this, e.getMessage(), Toast.LENGTH_LONG).show();
}
}
private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
ArrayList<ApplicationInfo> applist = new ArrayList<ApplicationInfo>();
for (ApplicationInfo info : list) {
try {
if (null != packageManager.getLaunchIntentForPackage(info.packageName)) {
applist.add(info);
}
} catch (Exception e) {
e.printStackTrace();
}
}
return applist;
}
public void showMessage(String title,String message)
{
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(message);
builder.show();
}
}
AppInfoAdapter :(用于在gridView项目中显示应用的适配器类）
public class AppInfoAdapter extends ArrayAdapter<ApplicationInfo>
{
private List<ApplicationInfo> appsList = null;
private Context context;
private PackageManager packageManager;
public AppInfoAdapter(Context context,int textViewResourceId, List<ApplicationInfo> appsList)
{
super(context, textViewResourceId, appsList);
this.context = context;
this.appsList = appsList;
packageManager = context.getPackageManager();
}
@Override
public int getCount() {
return ((null != appsList) ? appsList.size() : 0);
}
@Override
public ApplicationInfo getItem(int position) {
return ((null != appsList) ? appsList.get(position) : null);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if (null == view) {
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.layout_appinfo, null);
}
ApplicationInfo data = appsList.get(position);
if (null != data) {
TextView appName = (TextView) view.findViewById(R.id.tvName);
ImageView iconview = (ImageView) view.findViewById(R.id.ivIcon);
appName.setText(data.loadLabel(packageManager));
iconview.setImageDrawable(data.loadIcon(packageManager));
}
return view;
}
}