本文介绍了在Android的入门零位来自getDrawingCache（）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是我的code。我得到空值。我试图找出从早上的解决方案，我已经使用XML文件创建布局，然后我得到的看法位图，但我想它会动态和我创建布局编程参见下文code。
我的看法是出现罚款，但仍获得getDrawingCache（）空位图
的LinearLayout mainlayout =新的LinearLayout（getApplicationContext（））;
mainlayout.setOrientation（LinearLayout.VERTICAL）;
mainlayout.setLayoutParams（新的LayoutParams（LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT））;
ImageView的顶部=新ImageView的（getApplicationContext（））;
ImageView的BOT =新ImageView的（getApplicationContext（））;
位图底图= BitmapFactory.de codeResource（getResources（），R.drawable.collagebot）;
位图topImage = BitmapFactory.de codeResource（getResources（），R.drawable.collagetop）;
top.setImageBitmap（topImage）;
bot.setImageBitmap（底图）; 的LinearLayout midLayout =新的LinearLayout（getApplicationContext（））;
midLayout.setOrientation（LinearLayout.HORIZONTAL）;
midLayout.setLayoutParams（新的LayoutParams（LayoutParams.MATCH_PARENT，LayoutParams.WRAP_CONTENT））;
位图midlaybg = BitmapFactory.de codeResource（getResources（），R.drawable.bg）;
可绘制middrow =新BitmapDrawable（getResources（），midlaybg）;
midLayout.setBackground（middrow）; ImageView的正确=新ImageView的（getApplicationContext（））;
ImageView的左=新ImageView的（getApplicationContext（））;
位图右图= BitmapFactory.de codeResource（getResources（），R.drawable.fb）;
位图leftImage = BitmapFactory.de codeResource（getResources（），R.drawable.ic_launcher）;
可绘制rightdrow =新BitmapDrawable（getResources（），右图）;
可绘制leftdrow =新BitmapDrawable（getResources（），leftImage）;
right.setBackground（rightdrow）;
left.setBackground（leftdrow）;
right.setLayoutParams（新的LayoutParams（150,150））; left.setLayoutParams（新的LayoutParams（150,150））;
left.setLayoutParams（新LinearLayout.LayoutParams（150,150，10））;
midLayout.setPadding（50，0，0，0）;
midLayout.addView（右）;
midLayout.addView（左）; mainlayout.addView（顶部）;
mainlayout.addView（midLayout）;
mainlayout.addView（BOT）; 位图mainlaybg = BitmapFactory.de codeResource（getResources（），R.drawable.bg）;
可绘制maindrow =新BitmapDrawable（getResources（），mainlaybg）;
mainlayout.setBackground（maindrow）; mainlayout.setDrawingCacheEnabled（真）;
mainlayout.buildDrawingCache（）; //的setContentView（mainlayout）; //我不想的setContentView
Log.e（ceche，+ mainlayout.getDrawingCache（））; //这里我得到mainlayout鉴于空位图
位图IMGB = mainlayout.getDrawingCache（）;
解决方案
mainlayout.measure（MeasureSpec.makeMeasureSpec（
mainlayout.getLayoutParams（）。width方法，MeasureSpec.EXACTLY）
MeasureSpec.makeMeasureSpec（
mainlayout.getLayoutParams（）的高度，
MeasureSpec.EXACTLY））;
mainlayout.layout（0，0，mainlayout.getMeasuredWidth（），
mainlayout.getMeasuredHeight（））; mainlayout.setDrawingCacheEnabled（真）;
最后的位图bitmap_ =位图
.createBitmap（mainlayout.getDrawingCache（））;
mainlayout.setDrawingCacheEnabled（真）;
This is my code. I am Getting null value. i was trying to find out the solution since morning, i have created layout by using xml file then i got the bitmap of view, but i want it dynamically and I have created layout programatically see bellow code.My view is appearing fine but still getting getDrawingCache() null bitmap
LinearLayout mainlayout = new LinearLayout(getApplicationContext());
mainlayout.setOrientation(LinearLayout.VERTICAL);
mainlayout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
ImageView top= new ImageView(getApplicationContext());
ImageView bot= new ImageView(getApplicationContext());
Bitmap bottomImage = BitmapFactory.decodeResource(getResources(), R.drawable.collagebot);
Bitmap topImage =BitmapFactory.decodeResource(getResources(), R.drawable.collagetop);
top.setImageBitmap(topImage);
bot.setImageBitmap(bottomImage);
LinearLayout midLayout = new LinearLayout(getApplicationContext());
midLayout.setOrientation(LinearLayout.HORIZONTAL);
midLayout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
Bitmap midlaybg =BitmapFactory.decodeResource(getResources(), R.drawable.bg);
Drawable middrow = new BitmapDrawable(getResources(),midlaybg);
midLayout.setBackground(middrow);
ImageView right= new ImageView(getApplicationContext());
ImageView left= new ImageView(getApplicationContext());
Bitmap rightImage = BitmapFactory.decodeResource(getResources(), R.drawable.fb);
Bitmap leftImage =BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
Drawable rightdrow = new BitmapDrawable(getResources(),rightImage);
Drawable leftdrow = new BitmapDrawable(getResources(),leftImage);
right.setBackground(rightdrow);
left.setBackground(leftdrow);
right.setLayoutParams(new LayoutParams(150,150));
left.setLayoutParams(new LayoutParams(150,150));
left.setLayoutParams(new LinearLayout.LayoutParams(150, 150, 10));
midLayout.setPadding(50, 0, 0, 0);
midLayout.addView(right);
midLayout.addView(left);
mainlayout.addView(top);
mainlayout.addView(midLayout);
mainlayout.addView(bot);
Bitmap mainlaybg =BitmapFactory.decodeResource(getResources(), R.drawable.bg);
Drawable maindrow = new BitmapDrawable(getResources(),mainlaybg);
mainlayout.setBackground(maindrow);
mainlayout.setDrawingCacheEnabled(true);
mainlayout.buildDrawingCache();
// setContentView(mainlayout); // i dont want to setContentView
Log.e("ceche",""+mainlayout.getDrawingCache());// here i am getting null bitmap of mainlayout view
Bitmap imgb=mainlayout.getDrawingCache();
解决方案
mainlayout.measure(MeasureSpec.makeMeasureSpec(
mainlayout.getLayoutParams().width, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(
mainlayout.getLayoutParams().height,
MeasureSpec.EXACTLY));
mainlayout.layout(0, 0, mainlayout.getMeasuredWidth(),
mainlayout.getMeasuredHeight());
mainlayout.setDrawingCacheEnabled(true);
final Bitmap bitmap_ = Bitmap
.createBitmap(mainlayout.getDrawingCache());
mainlayout.setDrawingCacheEnabled(true);
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