來自未接來電廣播接收器屏幕的Android彈出

Question

在我的應用程序需要在屏幕上顯示一個彈出窗口，當用戶得到的未接來電，爲我寫了一個接收器其工作正常，但當我嘗試顯示彈出它顯示了一個異常

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) 

我該如何從我的接收器調用彈出窗口？還是有其他的選擇來顯示彈出？

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

你initMissedCallPopup方法是不正確的。

第一：

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

給你一個例外，因爲mContext不活動，但android.app.ReceiverRestrictedContext（異常信息非常清楚地表明這一點）。您正在onReceive中分配此變量。 您必須找到一些方法來獲取對包含SlidingPanel的活動的引用。