Android 如何在后台服务中使用alertDialog
我需要在后台服务中提示alertDialog,但它被坏的上下文崩溃了,我如何处理它,在哪里可以获得正确的上下文?1、您必须设置:Android 如何在后台服务中使用alertDialog,android,android-service,android-alertdialog,Android,Android Service,Android Alertdialog,我需要在后台服务中提示alertDialog,但它被坏的上下文崩溃了,我如何处理它,在哪里可以获得正确的上下文?1、您必须设置:mDialog.getWindow().setType( WindowManager.LayoutParams.TYPE_SYSTEM_ALERT) 2、 设置权限: <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> 1、必须设置:mDialog.getWin
mDialog.getWindow().setType(
WindowManager.LayoutParams.TYPE_SYSTEM_ALERT)代码>
2、 设置权限:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
1、必须设置:mDialog.getWindow().setType(
WindowManager.LayoutParams.TYPE_SYSTEM_ALERT)代码>
2、 设置权限:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
服务内部代码分类至打开警报对话框
private void showAlertDialog() {
KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
KeyguardManager.KeyguardLock kl = km.newKeyguardLock("MyKeyguardLock");
kl.disableKeyguard();
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK| PowerManager.ACQUIRE_CAUSES_WAKEUP
| PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
wakeLock.acquire();
final CharSequence[] items = { getString(R.string.test1), getString(R.string.tes2), getString(R.string.test3), getString(R.string.cancel) };
AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
builder.setTitle("Title");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals(getString(R.string.test1))) {
dialog.dismiss();
} else if (items[item].equals(getString(R.string.test2))) {
dialog.dismiss();
} else if (items[item].equals(getString(R.string.test3))) {
}else if (items[item].equals(getString(R.string.cancel))) {
dialog.dismiss();
}
}
});
alert = builder.create();
alert.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
alert.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON|
WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|
WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|
WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
alert.show();
alert.setOnDismissListener(new OnDismissListener() {
@Override
public void onDismiss(DialogInterface arg0) {
}
});
alert.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
}
});
}
您必须在清单文件中添加权限
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
您可以根据需要自定义“警报”对话框
完成在服务中编写代码类以打开警报对话框
private void showAlertDialog() {
KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
KeyguardManager.KeyguardLock kl = km.newKeyguardLock("MyKeyguardLock");
kl.disableKeyguard();
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK| PowerManager.ACQUIRE_CAUSES_WAKEUP
| PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
wakeLock.acquire();
final CharSequence[] items = { getString(R.string.test1), getString(R.string.tes2), getString(R.string.test3), getString(R.string.cancel) };
AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
builder.setTitle("Title");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals(getString(R.string.test1))) {
dialog.dismiss();
} else if (items[item].equals(getString(R.string.test2))) {
dialog.dismiss();
} else if (items[item].equals(getString(R.string.test3))) {
}else if (items[item].equals(getString(R.string.cancel))) {
dialog.dismiss();
}
}
});
alert = builder.create();
alert.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
alert.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON|
WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|
WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|
WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
alert.show();
alert.setOnDismissListener(new OnDismissListener() {
@Override
public void onDismiss(DialogInterface arg0) {
}
});
alert.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
}
});
}
您必须在清单文件中添加权限
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
您可以根据需要自定义“警报”对话框
完成被接受的答案在Oreo中不起作用+
请在WindowManager中使用标记类型\应用程序\覆盖,而不是类型\电话或系统\警报。布局参数:
使用
WindowManager.LayoutParams.TYPE\u应用程序\u覆盖
反而
WindowManager.LayoutParams.TYPE\系统\警报
还是覆盖层不显示?然后检查您的应用程序是否具有该权限
Settings.canDrawOverlays()如果为false,则为
用户也应该有此权限强>
这是在棉花糖中引入的
//检查Android是否为M或更高版本
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
// Show alert dialog to the user saying a separate permission is
needed
// Launch the settings activity if the user prefers
Intent myIntent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
startActivity(myIntent);
}
公认的答案在奥利奥是行不通的+
请在WindowManager中使用标记类型\应用程序\覆盖,而不是类型\电话或系统\警报。布局参数:
使用
WindowManager.LayoutParams.TYPE\u应用程序\u覆盖
反而
WindowManager.LayoutParams.TYPE\系统\警报
还是覆盖层不显示?然后检查您的应用程序是否具有该权限
Settings.canDrawOverlays()如果为false,则为
用户也应该有此权限强>
这是在棉花糖中引入的
//检查Android是否为M或更高版本
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
// Show alert dialog to the user saying a separate permission is
needed
// Launch the settings activity if the user prefers
Intent myIntent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
startActivity(myIntent);
}
你需要活动上下文来显示警报对话框我不想要任何活动,除了后台服务。使用toast来显示消息你也可以试试@LeonLeung,你解决问题了吗?你需要活动上下文来显示警报对话框我不想要任何活动,除了后台服务。用祝酒词来显示消息你也可以试试@LeonLeung,你解决问题了吗?