java - Android 未接来电广播接收器在屏幕上弹出

Question

在我的应用程序中，当用户未接来电时，我需要在屏幕上显示一个弹出窗口，因为我编写了一个接收器，它工作正常，但当我尝试显示弹出窗口时，它显示一个异常

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)

如何从接收器中调用弹出窗口？或者还有其他选择来显示弹出窗口吗？

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 方法不正确。

第一:

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

给你一个异常，因为 mContext 不是 Activity 而是 android.app.ReceiverRestrictedContext (异常消息非常清楚地表明了这一点)。您正在 onReceive 中分配此变量。您必须找到某种方法来获取对包含 SlidingPanel 的 Activity 的引用。