自定义视图不会正常膨胀

尝试使用地图构建安卓游戏（现在我们只是试图让它画一个圆圈），并且我们创建的视图不会正常膨胀，应用会一直崩溃自定义视图不会正常膨胀

活性

package edu.virignia.cs2110.dlf4mf.ghostapocalypse; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.Menu;  
import android.view.MenuItem; 

public class GameActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_game); 
     MapView mv = (MapView)findViewById(R.id.map_view); 

    } 
}

活性布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="${relativePackage}.${activityClass}" > 

    <MapView 
     android:id="@+id/map_view" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent"/> 

</RelativeLayout>

定制视图

package edu.virignia.cs2110.dlf4mf.ghostapocalypse; 

import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Point; 
import android.graphics.drawable.Drawable; 
import android.util.AttributeSet; 
import android.util.DisplayMetrics; 
import android.view.Display; 
import android.view.SurfaceView; 
import android.view.View; 

public class MapView extends SurfaceView { 

    private final Paint mPaint = new Paint(); 

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

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

    public MapView(Context context, AttributeSet attrs, int defStyleAttr) { 
     super(context, attrs, defStyleAttr); 
     init(); 
    } 

    private void init(){ 
     int h = 500; 
     int w = 500; 
     Canvas grid = new Canvas(Bitmap.createBitmap(h,w, Bitmap.Config.ARGB_8888)); 
     draw(grid); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 
     mPaint.setStyle(Paint.Style.FILL); 
     int c = R.color.material_deep_teal_500; 
     mPaint.setColor(c); 
     canvas.drawCircle(250, 250, 150, mPaint); 
    } 

}

来源

2014-11-14 Fonti

用您的XML布局替换<MapView与<edu.virignia.cs2110.dlf4mf.ghostapocalypse.MapView。自定义视图的类名称必须是完全限定的。

来源

2014-11-14 19:07:00 kcoppock

自定义视图不会正常膨胀

回答

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