java - Android应用程序ActivityThread中的RuntimeException未能找到一些来源？

Question

我需要帮助来解决 native Android 应用程序引发的 RuntimeException 问题。 我无法定义导致此异常的原因。这是堆栈跟踪和代码。这里似乎有什么问题？

Thread [<1> main] (Suspended (exception RuntimeException))  
    ActivityThread.performLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 1879    
    ActivityThread.handleLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 1980 
    ActivityThread.access$600(ActivityThread, ActivityThread$ActivityClientRecord, Intent) line: 122    
    ActivityThread$H.handleMessage(Message) line: 1146  
    ActivityThread$H(Handler).dispatchMessage(Message) line: 99 
    Looper.loop() line: 137 
    ActivityThread.main(String[]) line: 4340    
    Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
    Method.invoke(Object, Object...) line: 511  
    ZygoteInit$MethodAndArgsCaller.run() line: 784  
    ZygoteInit.main(String[]) line: 551 
    NativeStart.main(String[]) line: not available [native method]  

代码

package com.example;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

import com.example.hellogooglemaps.R;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;

import com.google.android.maps.MapView.LayoutParams;  
import android.view.View;
import android.widget.LinearLayout;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapController;

import java.util.List;

import com.google.android.maps.Overlay;
import com.google.android.maps.MapView.LayoutParams;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;

import android.widget.Toast;

public class HellogooglemapsActivity extends MapActivity {
    MapView mapView; 
    MapController mc;
    GeoPoint p,p2;
    /** Called when the activity is first created. */
    @Override

    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);

       mapView = (MapView) findViewById(R.id.mapview);
       LinearLayout zoomLayout = (LinearLayout)findViewById(R.id.zoom);  
       View zoomView = mapView.getZoomControls(); 

       zoomLayout.addView(zoomView, 
           new LinearLayout.LayoutParams(
               LayoutParams.WRAP_CONTENT, 
               LayoutParams.WRAP_CONTENT)); 
       mapView.displayZoomControls(true);

       mc = mapView.getController();
       String coordinates[] = {"59.3948", "24.662"};
       double lat = Double.parseDouble(coordinates[0]);
       double lng = Double.parseDouble(coordinates[1]);

       p = new GeoPoint(
           (int) (lat * 1E6), 
           (int) (lng * 1E6));

       MapOverlay mapOverlay = new MapOverlay();
       List<Overlay> listOfOverlays = mapView.getOverlays();
       listOfOverlays.clear();
       listOfOverlays.add(mapOverlay); 

       mc.animateTo(p);
       mc.setZoom(14); 
       mapView.invalidate();

   }
    class MapOverlay extends com.google.android.maps.Overlay {
        @Override
        public boolean draw(Canvas canvas, MapView mapView, 
        boolean shadow, long when) 
        {
            super.draw(canvas, mapView, shadow);                   

            //---translate the GeoPoint created in onCreate to screen pixels---
            Point screenPts = new Point();
            mapView.getProjection().toPixels(p, screenPts);

            //---add the marker---
            Bitmap bmp = BitmapFactory.decodeResource(
                getResources(), R.drawable.map_marker);            
            canvas.drawBitmap(bmp, screenPts.x-15, screenPts.y-32, null);      

            // add a new marker to coords given below
            String coordinates[] = {"59.40", "24.80"};
            double lat = Double.parseDouble(coordinates[0]);
            double lng = Double.parseDouble(coordinates[1]);
            p2 = new GeoPoint( (int) (lat * 1E6), (int) (lng * 1E6));
            Point screenPts2 = new Point();
            mapView.getProjection().toPixels(p2, screenPts2);               
            canvas.drawBitmap(bmp, screenPts2.x-15, screenPts2.y-32, null); 

            Toast.makeText(getBaseContext(), 
                    p2.getLatitudeE6() / 1E6 + "," + 
                    p2.getLongitudeE6() /1E6 , 
                    Toast.LENGTH_SHORT).show();

            return true;
        }
} 
    @Override
    protected boolean isRouteDisplayed() {
        // TODO Auto-generated method stub
        return false;
    }
}

AVD:Google API 14

Answer 1

异常堆栈跟踪 + 消息通常会逐字打印到 logcat。堆栈跟踪的第一行表明，当系统调用 Instrumentation.newActivity(ClassLoader, String, Intent) 时，无法实例化 Activity 对象。在 logcat 中，您应该能够找到类似“无法实例化 Activity : ”的内容，其中 是您非常感兴趣的内容。