Question

当用户插入辅助线时，我希望显示AlertDialog消息。当用户拔下辅助线时，我希望警报消息消失。我不希望用户能够摆脱AlertDialog消息，直到他/她拔掉辅助线。到目前为止，我的BroadcastReceiver与Toast一起使用。但它不适用于AlertDialog。

import android.app.AlertDialog;
import android.content.BroadcastReceiver; 
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnDismissListener;
import android.content.Intent;
import android.widget.Toast;


 public class AuxChangeReceiver extends BroadcastReceiver {

 @Override 
 public void onReceive(Context context, Intent intent) {

     AlertDialog.Builder removeAux = new AlertDialog.Builder(context);
        if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) {
            final int state = intent.getIntExtra("state", -1);
            switch (state) {
            case 0:
                removeAux.setOnDismissListener( new OnDismissListener() {
                    public void onDismiss(DialogInterface dialog) {
                        if (state==0) {
                            dialog.dismiss();
                        }
                    }
                });

                break;
            case 1:
                removeAux.setMessage("Unplug Aux!").create().show();
                break;
            default:
                Toast toast3 = Toast.makeText(context, "No clue", Toast.LENGTH_SHORT);
                toast3.show();
            }
        }
    }
}

这是我使用Toast的代码，但我不想要Toast：

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;


 public class AuxChangeReceiver extends BroadcastReceiver {

 @Override 
 public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) {
            final int state = intent.getIntExtra("state", -1);
            switch (state) {
            case 0:
                Toast toast1 = Toast.makeText(context, "There is no aux cord detected", Toast.LENGTH_SHORT);
                toast1.show();
                break;
            case 1:
                Toast toast2 = Toast.makeText(context, "Aux Cord Detected, Please unplug it!", Toast.LENGTH_SHORT);
                toast2.show();
                break;
            default:
                Toast toast3 = Toast.makeText(context, "No clue", Toast.LENGTH_SHORT);
                toast3.show();
            }
        }
    }
}

Answer 1

解决方案是在AlertDialog而不是在接收器中创建onCreate()，以便您可以在活动中的任何位置显示和关闭它 - 如下所示。首先声明你的AlertDialog如此：

public class MainActivity extends Activity  {
    private AlertDialog alertDialog;

然后在onCreate()：

alertDialog = new AlertDialog.Builder(MainActivity.this).create();
alertDialog.setTitle("Warning");
alertDialog.setMessage("Aux cord plugged in, please unplug...");

然后插入辅助线（case 1:）：

alertDialog.show();

当拔下电源线时（case 0:）：

alertDialog.dismiss();

Answer 2

你必须像这样

创建一个警告对话框的方法

 public AlertDialog CreateAlert(String title, String message) {
        AlertDialog alert = new AlertDialog.Builder(this).create();
        alert.setTitle(title);
        alert.setMessage(message);
        alert.show();
        return alert;

    }

通过调用此方法

来触发所需的警报

CreateAlert("YOUR TITTLE", "YOUR MESSAGE");

拔下辅助线时，Android AlertDialog不会解除

2 个答案: