我想创建一个android应用程序，该应用程序将在30秒后显示给我AlertDialog，但我想使AlertDialog显示在android中的任何位置，例如在android的家中。像这样http://www.papktop.com/wp-content/uploads/2012/01/Popup-Notifier-1.jpg这是我的代码（主要活动）
public class MainActivity extends ActionBarActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//EventBus.getDefault().register(this);
mTextField = (TextView) findViewById(R.id.mTextField);
}
public void show(View view) {
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
alertDialog.setMessage("Nek Test");
// alertDialog.setIcon(getResources().getDrawable(R.mipmap.notification_image));
alertDialog.setTitle("Reminder");
alertDialog.setPositiveButton("Got it", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
mTextField.setText("done!");
alertDialog.show();
}
}.start();
}
}
为了在应用程序外部显示对话框，例如在首页上显示对话框，您需要将此权限放入清单中：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
创建这样的服务：
public class AlertService extends Service {
private static Context context;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
context = this;
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);
alertDialog.setMessage("Nek Test");
alertDialog.setTitle("Reminder");
/**ADD THIS FOR DISPLAY THE ALERT ANYWHERE*/
alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
alertDialog.setPositiveButton("Got it", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
alertDialog.show();
}
}.start();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}//End class
最后从活动启动服务：
startService(new Intent(this, AlertService.class));
并将此行添加到清单中的“ application”标签中：
<service android:name=".AlertService" />
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我来说两句