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