未接來電廣播接收器在屏幕上顯示Android彈出窗口

Question

在我的應用程序中，當用戶未接來電時，我需要在屏幕上顯示一個彈出窗口，為此，我編寫了一個接收機，其工作正常，但是當我嘗試顯示彈出窗口時，它顯示了異常

06-30 15:24:11.320: E/AndroidRuntime(21759): java.lang.ClassCastException: android.app.ReceiverRestrictedContext cannot be cast to android.app.Activity
06-30 15:53:20.883: E/AndroidRuntime(22873):    at com.ieltsdialer.receiver.MissedCallReceiver.initMissedCallPopup(MissedCallReceiver.java:96)
06-30 15:53:20.883: E/AndroidRuntime(22873):    at com.ieltsdialer.receiver.MissedCallReceiver$CustomPhoneStateListener.onCallStateChanged(MissedCallReceiver.java:83)

我如何從接收器中調用彈出窗口？ 還是有其他顯示彈出框的替代方法？

MissedCallReceiver.java

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import com.ieltsdialer.R;
import com.ieltsdialer.common.SlidingPanel;

public class MissedCallReceiver extends BroadcastReceiver{


    private static final String TAG = "BroadcastReceiver";  
    Context mContext;  
    String incoming_nr;  
    private int prev_state;  
    private Animation animShow, animHide;

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub

        TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE); //TelephonyManager object  
        CustomPhoneStateListener customPhoneListener = new CustomPhoneStateListener();  
        telephony.listen(customPhoneListener, PhoneStateListener.LISTEN_CALL_STATE); //Register our listener with TelephonyManager  
        Bundle bundle = intent.getExtras();  
        String phoneNr= bundle.getString("incoming_number");  
        Log.v(TAG, "phoneNr: "+phoneNr);  
        mContext=context;  
    }

    /* Custom PhoneStateListener */  
    public class CustomPhoneStateListener extends PhoneStateListener{

        private static final String TAG = "CustomPhoneStateListener";  

        @Override  
        public void onCallStateChanged(int state, String incomingNumber){  

            if(incomingNumber!=null&&incomingNumber.length()>0) incoming_nr=incomingNumber;   
            switch(state){  
                case TelephonyManager.CALL_STATE_RINGING:

                    Log.d(TAG, "CALL_STATE_RINGING");  
                    prev_state=state;  

                break;  

                case TelephonyManager.CALL_STATE_OFFHOOK:  

                    Log.d(TAG, "CALL_STATE_OFFHOOK");  
                    prev_state=state;  

                break;  

                case TelephonyManager.CALL_STATE_IDLE:  

                    Log.d(TAG, "CALL_STATE_IDLE==>"+incoming_nr);  
                    if((prev_state==TelephonyManager.CALL_STATE_OFFHOOK)){  

                        prev_state=state;  
                        //Answered Call which is ended
                        Toast.makeText(mContext, "answered call end", 5).show();

                    }  

                    if((prev_state==TelephonyManager.CALL_STATE_RINGING)){  

                        prev_state=state;  
                        //Rejected or Missed call  
                        Toast.makeText(mContext, " missed call end"+incomingNumber, 5).show();
                        initMissedCallPopup();

                    }  

                break;  
            }  
        }  
    }

    public void initMissedCallPopup() {
        // TODO Auto-generated method stub
        final SlidingPanel popup = (SlidingPanel) ((Activity) mContext).findViewById(R.id.popup_window);


        animShow = AnimationUtils.loadAnimation( mContext, R.anim.popup_show);
        animHide = AnimationUtils.loadAnimation( mContext, R.anim.popup_hide);

        final ImageButton   hideButton = (ImageButton) ((Activity) mContext).findViewById(R.id.hide_popup_button);

        popup.setVisibility(View.VISIBLE);
        popup.startAnimation( animShow );
        hideButton.setEnabled(true);

        hideButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                popup.startAnimation( animHide );
                hideButton.setEnabled(false);
                popup.setVisibility(View.GONE);
        }});

        final TextView appName = (TextView) ((Activity) mContext).findViewById(R.id.app_name);
        final TextView description = (TextView) ((Activity) mContext).findViewById(R.id.missed_call_description);

        appName.setText("App Title");
        description.setText("Missed call Description");

    }

}

SlidingPanel.java

public class SlidingPanel extends LinearLayout 
{ 
    private Paint   innerPaint, borderPaint ;

    public SlidingPanel(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public SlidingPanel(Context context) {
        super(context);
        init();
    }

    private void init() {
        innerPaint = new Paint();
        innerPaint.setARGB(100, 25, 25, 75); //gray
        innerPaint.setAntiAlias(true);

        borderPaint = new Paint();
        borderPaint.setARGB(255, 255, 255, 255);
        borderPaint.setAntiAlias(true);
        borderPaint.setStyle(Style.STROKE);
        borderPaint.setStrokeWidth(5);
    }

    public void setInnerPaint(Paint innerPaint) {
        this.innerPaint = innerPaint;
    }

    public void setBorderPaint(Paint borderPaint) {
        this.borderPaint = borderPaint;
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {

        RectF drawRect = new RectF();
        drawRect.set(0,0, getMeasuredWidth(), getMeasuredHeight());

        canvas.drawRoundRect(drawRect, 5, 5, innerPaint);
        canvas.drawRoundRect(drawRect, 5, 5, borderPaint);

        super.dispatchDraw(canvas);
    }
}

Answer 1

您的initMissedCallPopup方法不正確。

第一：

final SlidingPanel popup = (SlidingPanel) ((Activity) mContext).findViewById(R.id.popup_window);

給您一個異常，因為mContext不是Activity而是android.app.ReceiverRestrictedContext（異常消息非常清楚地表明了這一點）。 您正在onReceive中分配此變量。 您必須找到某種方式來獲取對包含SlidingPanel的活動的引用。