如何在 android 中接收广播时打开对话框？

Question

接收phone状态时如何打开Dialog。因为每当收到 State 时，都会导致以下错误：

android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

我该如何解决这个问题？

Phone State is Idle 然后我调用Dialog。任何帮助将不胜感激。这是我的代码。

final Dialog dialog = new Dialog(mcontext);
                        dialog.setContentView(R.layout.dialog);
                        dialog.setTitle("Android Custom Dialog Box");
                        final EditText et_remark = (EditText) dialog
                                .findViewById(R.id.et_remark);

                        Button dialogButton = (Button) dialog
                                .findViewById(R.id.btn_submit);
                        dialogButton
                                .setOnClickListener(new OnClickListener() {
                                    @Override
                                    public void onClick(View v) {
                                        dialog.dismiss();
                                        String remark = et_remark.getText()
                                                .toString();

                                        if (call_duration.equals("0")) {


                                            Toast.makeText(mcontext,
                                                    " miss",
                                                    Toast.LENGTH_LONG)
                                                    .show();
                                        } else {

                                            if (cType.equals("OUTGOING")) {


                                                Toast.makeText(
                                                        mcontext,
                                                        " out ",
                                                        Toast.LENGTH_LONG)
                                                        .show();

                                            } else {

                                                Toast.makeText(mcontext,
                                                        " inc",
                                                        Toast.LENGTH_LONG)
                                                        .show();
                                            }
                                        }

                                    }
                                });
                        dialog.show();

Answer 1

广播接收是app service(intent service)。 intent service 有一些限制，第一个也是最重要的是“它不能直接与您的用户界面交互”。

然后你有一个替代方法，如果你的应用程序打开，你可以尝试使用 handle，然后 handle 捕获消息并从 handle 中抛出对话框。告诉我我是否帮助了你和好的编程！

Answer 2

这样试试

广播接收器

public class MyCallReceiver extends BroadcastReceiver {



    private String incomingNumber;

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        if  (intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(
                TelephonyManager.EXTRA_STATE_RINGING)) {

             // get the phone number 
             incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
                Intent i = new Intent(context, Disp_Alert_dialog.class); 
               // i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                //i.putExtra("Number", incomingNumber);
                //i.putExtra("type", "incoming");
                context.startActivity(i);
        //   Toast.makeText(context, "Call from:" +incomingNumber, Toast.LENGTH_LONG).show();



            // This code will execute when the phone has an incoming call



        } else  {


            // This code will execute when the call is disconnected
       //  Toast.makeText(context, "Detected call hangup event", Toast.LENGTH_LONG).show();

        }
    }


}

Alertclass.java

public class Disp_Alert_dialog extends Activity{

    private String nums;
    private String outnum;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        Intent iin= getIntent();

        nums=iin.getStringExtra("Number");




    //  Toast.makeText(Disp_Alert_dialog.this, "Got it"+nums, Toast.LENGTH_LONG).show();

        AlertDialog.Builder builder = new AlertDialog.Builder(this);


        builder
            .setTitle("")
            .setMessage("")
            .setCancelable(false)
            .setPositiveButton("yes", new DialogInterface.OnClickListener() 
            {
                public void onClick(DialogInterface dialog, int id) 
                {
                   Intent intent=new Intent(Disp_Alert_dialog.this,MainActivity.class);

                   intent.putExtra("Nums", nums);
                   startActivity(intent);
                   Disp_Alert_dialog.this.finish();
                    /*HomeFragment fragobj = new HomeFragment();
                    Bundle bundle = new Bundle();
                    bundle.putString("Nums", nums);
                    // set Fragmentclass Arguments

                    fragobj.setArguments(bundle);*/

                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() 
            {
                public void onClick(DialogInterface dialog, int id) 
                {
                    dialog.cancel();
                }
            });
        AlertDialog alert = builder.create();
        alert.show();
    }

}

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