Android:將View的內容映射成Bitmap轉圖片導出 – Android移動開發技術文章_手機開發 Android移動開發教學課程

 

前段時間在網上看到這麼個例子是將view映射到一個bitmap中,稍加改進可以用於一些截圖工具或者截圖軟件(QQ截圖之類),例子寫的不夠完善,不過很有些學習的意義內容大致如下:

在Android中自有獲取view中的cache內容,然後將內容轉換成bitmap,方法名是:getDrawingCache(),返回結果為Bitmap,但是剛開始使用的時候,得到的結果都是null,所以在一個論壇裡查到瞭正確的使用方法.代碼如下:

contentLayout.setDrawingCacheEnabled(true);    

        contentLayout.measure(    

               MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),    

                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));    

       contentLayout.layout(0, 0, contentLayout.getMeasuredWidth(),    

                contentLayout.getMeasuredHeight());    

  

     contentLayout.buildDrawingCache();    

          

      Bitmap bitmap= contentLayout.getDrawingCache();   

 

在使用的時候調用

Bitmap bitmap = view.getDrawingCache();

就可以得到圖片的bitmap瞭。

為瞭測試這個功能,作者使用瞭兩種方式來創建LinerLayout中的內容,一種是在xml文件中就將view的內容添加瞭,隻需在代碼中添加對應ImageView中的圖片就行瞭;另一種是動態添加LinerLayout中的View。

 

setview的代碼:

public void onCreate(Bundle savedInstanceState) {    

    super.onCreate(savedInstanceState);    

    setContentView(R.layout.set_view);    

    contentLayout = (LinearLayout) findViewById(R.id.content);    

    imgSource1 = (ImageView) findViewById(R.id.imgSource1);    

    imgSource2 = (ImageView) findViewById(R.id.imgSource2);    

    imgCache = (ImageView) findViewById(R.id.imgCache);    

   

   imgSource1.setImageResource(R.drawable.source1);    

    imgSource2.setImageResource(R.drawable.source2);    

       

    contentLayout.setDrawingCacheEnabled(true);    

    contentLayout.measure(    

            MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),    

            MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));    

    contentLayout.layout(0, 0, contentLayout.getMeasuredWidth(),    

            contentLayout.getMeasuredHeight());    

   

    contentLayout.buildDrawingCache();    

        

    Bitmap bitmap= contentLayout.getDrawingCache();    

    if(bitmap!=null){    

        imgCache.setImageBitmap(bitmap);    

    }else{    

        Log.i("CACHE_BITMAP", "DrawingCache=null");    

    }    

}   

第二種方法代碼:

 

private void addRelativeLayout() {    

        // TODO Auto-generated method stub    

        RelativeLayout.LayoutParams layoutpare = new RelativeLayout.LayoutParams(    

                LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);    

  

        RelativeLayout relativeLayout = new RelativeLayout(this);    

        relativeLayout.setLayoutParams(layoutpare);    

   

        ImageView imgView1 = new ImageView(this);    

        ImageView imgView2 = new ImageView(this);    

        imgView1.setImageResource(R.drawable.source1);    

        imgView2.setImageResource(R.drawable.source2);    

        RelativeLayout.LayoutParams img1 = new RelativeLayout.LayoutParams(38,    

                38);    

        img1.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);    

        RelativeLayout.LayoutParams img2 = new RelativeLayout.LayoutParams(38,    

                38);    

        img2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, RelativeLayout.TRUE);    

   

        relativeLayout.addView(imgView1, img1);    

        relativeLayout.addView(imgView2, img2);    

        addViewContent.addView(relativeLayout);    

    }    

   

    /**   

     * 添加圖片源   

     */   

   private void addImgSource() {    

        ImageView imgView1 = new ImageView(this);    

        ImageView imgView2 = new ImageView(this);    

        imgView1.setImageResource(R.drawable.source1);    

        imgView2.setImageResource(R.drawable.source2);    

        addViewContent.addView(imgView1, new LayoutParams(    

                LinearLayout.LayoutParams.WRAP_CONTENT,    

                LinearLayout.LayoutParams.WRAP_CONTENT));    

        addViewContent.addView(imgView2, new LayoutParams(    

                LinearLayout.LayoutParams.WRAP_CONTENT,    

                LinearLayout.LayoutParams.WRAP_CONTENT));    

    }     

本文出自 “HDDevTeam” 博客

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