Android实现将控件等View转化为Bitmap对象，通过ImageView显示的功能

Android实现将控件等View转化为Bitmap对象，通过ImageView显示的功能

<LinearLayout
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"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.dateselector.MainActivity" >   <ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:layout_centerHorizontal="true"
android:src="@drawable/ic_launcher" />   <LinearLayout
android:id="@+id/layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">   <TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我是好人"
android:layout_centerHorizontal="true"/>   <ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_centerHorizontal="true"
android:src="@drawable/ic_launcher" />   </LinearLayout>
</LinearLayout>

package com.example.dateselector;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends Activity {
private ImageView imageView;
private LinearLayout layout;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView);
layout = (LinearLayout) findViewById(R.id.layout);
// 转化图片
Bitmap bitmap = getViewBitmap(layout, 300, 300);
imageView.setImageBitmap(bitmap);
}

/**
* 把View绘制到Bitmap上
*
* @param view
*            需要绘制的View
* @param width
*            该View的宽度
* @param height
*            该View的高度
* @return 返回Bitmap对象 add by csj 13-11-6
*/
public Bitmap getViewBitmap(View comBitmap, int width, int height) {
Bitmap bitmap = null;
if (comBitmap != null) {
comBitmap.clearFocus();
comBitmap.setPressed(false);

boolean willNotCache = comBitmap.willNotCacheDrawing();
comBitmap.setWillNotCacheDrawing(false);

// Reset the drawing cache background color to fully transparent
// for the duration of this operation
int color = comBitmap.getDrawingCacheBackgroundColor();
comBitmap.setDrawingCacheBackgroundColor(0);
float alpha = comBitmap.getAlpha();
comBitmap.setAlpha(1.0f);

if (color != 0) {
comBitmap.destroyDrawingCache();
}

int widthSpec = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
int heightSpec = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
comBitmap.measure(widthSpec, heightSpec);
comBitmap.layout(0, 0, width, height);

comBitmap.buildDrawingCache();
Bitmap cacheBitmap = comBitmap.getDrawingCache();
if (cacheBitmap == null) {
Log.e("view.ProcessImageToBlur", "failed getViewBitmap(" + comBitmap + ")", new RuntimeException());
return null;
}
bitmap = Bitmap.createBitmap(cacheBitmap);
// Restore the view
comBitmap.setAlpha(alpha);
comBitmap.destroyDrawingCache();
comBitmap.setWillNotCacheDrawing(willNotCache);
comBitmap.setDrawingCacheBackgroundColor(color);
}
return bitmap;
}

}

/**
* 把View绘制到Bitmap上
*
* @param view
*            需要绘制的View
* @param width
*            该View的宽度
* @param height
*            该View的高度
* @return 返回Bitmap对象 add by csj 13-11-6
*/
public Bitmap getViewBitmap(View comBitmap, int width, int height) {
Bitmap bitmap = null;
if (comBitmap != null) {
comBitmap.clearFocus();
comBitmap.setPressed(false);

boolean willNotCache = comBitmap.willNotCacheDrawing();
comBitmap.setWillNotCacheDrawing(false);

// Reset the drawing cache background color to fully transparent
// for the duration of this operation
int color = comBitmap.getDrawingCacheBackgroundColor();
comBitmap.setDrawingCacheBackgroundColor(0);
float alpha = comBitmap.getAlpha();
comBitmap.setAlpha(1.0f);

if (color != 0) {
comBitmap.destroyDrawingCache();
}

int widthSpec = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
int heightSpec = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
comBitmap.measure(widthSpec, heightSpec);
comBitmap.layout(0, 0, width, height);

comBitmap.buildDrawingCache();
Bitmap cacheBitmap = comBitmap.getDrawingCache();
if (cacheBitmap == null) {
Log.e("view.ProcessImageToBlur", "failed getViewBitmap(" + comBitmap + ")", new RuntimeException());
return null;
}
bitmap = Bitmap.createBitmap(cacheBitmap);
// Restore the view
comBitmap.setAlpha(alpha);
comBitmap.destroyDrawingCache();
comBitmap.setWillNotCacheDrawing(willNotCache);
comBitmap.setDrawingCacheBackgroundColor(color);
}
return bitmap;
}