在Activity中调用AlertDialog

只能在Activity中调用AlertDialog，所以要想在Receiver中使用AlerDialog，可以在Receiver中用starActivity()启动有AlertDialog的Activity。

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@Override
public void onReceive(final Context context, Intent intent) {
    Intent i=new Intent(context,AlertDialogActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);;
    context.startActivity(i);
}
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public class AlertDialogActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        AlertDialog.Builder dialogBuilder=new AlertDialog.Builder(this);
        dialogBuilder.setTitle("Warning");

        dialogBuilder.setMessage("you are force to be offline");
        dialogBuilder.setCancelable(false);
        dialogBuilder.setPositiveButton("OK",
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCollector.finishAll();
                        Intent intent = new Intent(AlertDialogActivity.this,LoginActivity.class);
                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(intent);//重新启动LoginActivity

                    }
                });
        AlertDialog alertDialog=dialogBuilder.create();

        alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
        alertDialog.show();
    }
}