在Android中更新特定布局的DrawingCache

问题描述：

我在android中获取布局的正确“ScreenShot”时遇到了问题。该布局包含EditTexts和TextViews。在Android中更新特定布局的DrawingCache

下面的代码只给出了布局的“ScreenShot”，但是当我在EditText或TextView中更改字符串时，“ScreenShot”不会更新！

如何确保“ScreenShot”可以更新并与屏幕上显示的相同？

private Bitmap getBitmap() { 
    Bitmap bitmap = null; 
    LayoutInflater factorys = LayoutInflater.from(this); 
    final View textEntryView = factorys.inflate(R.layout.activity_main, null); 
    View ll = textEntryView.findViewById(R.id.ll_layout); 
    ll.setDrawingCacheEnabled(true); 
    ll.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), 
      View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)); 
    ll.layout(0, 0, ll.getMeasuredWidth(), ll.getMeasuredHeight()); 
    ll.buildDrawingCache(); 
    bitmap = Bitmap.createBitmap(ll.getDrawingCache()); 
    //bitmap=getCacheBitmapFromView(ll); 
    ll.setDrawingCacheEnabled(false); 
    return bitmap; 
}

这里是整个代码

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Button btn = (Button) findViewById(R.id.button1); 
     btn.setOnClickListener(mycl); 
    } 

    OnClickListener mycl = new OnClickListener() { 

     @Override 
     public void onClick(View v) { 

      // TODO Auto-generated method stub 
      Bitmap mybpic = null; 
      mybpic = getBitmap(); 
      ImageView imageView = (ImageView) findViewById(R.id.imageView1); 
      imageView.setImageBitmap(mybpic); 
     } 
    }; 

    private Bitmap getBitmap() { 
     Bitmap bitmap = null; 
     LayoutInflater factorys = LayoutInflater.from(this); 
     final View textEntryView = factorys.inflate(R.layout.activity_main, 
       null); 
     View ll = textEntryView.findViewById(R.id.ll_layout); 

     ll.destroyDrawingCache(); 
     ll.invalidate(); 
     ll.setDrawingCacheEnabled(true); 
     ll.measure(View.MeasureSpec.makeMeasureSpec(0, 
       View.MeasureSpec.UNSPECIFIED), View.MeasureSpec 
       .makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)); 
     ll.layout(0, 0, ll.getMeasuredWidth(), ll.getMeasuredHeight()); 
     ll.buildDrawingCache(); 

     bitmap = Bitmap.createBitmap(ll.getDrawingCache()); 
     // bitmap=getCacheBitmapFromView(ll); 
     ll.setDrawingCacheEnabled(false); 
     return bitmap; 
    } 
}

尝试添加ll.destroyDrawingCache（）;之前ll.setDrawingCacheEnabled（true）; –

我试过 ll.destroyDrawingCache（）; ll.invalidate（）; 它不为我工作 @DivyeshPatel – Lee

尝试为无效和的EditText TextView的 –

答

解决了，我不应该使用

LayoutInflater

LayoutInflater只是实例化一个布局XML文件到其相应的机器人。 view.View对象，但不是当前图形 see here

只是用findViewbyId得到视图对象然后

view.setDrawingCacheEnabled(true); 
view.buildDrawingCache(true); 
Bitmap drawingCache = view.getDrawingCache();

的作品！

在Android中更新特定布局的DrawingCache

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