关键点canvas.drawBitmap(bitmap, srcRect, dstRect, null);
将bitmap的srcRect区域绘制到canvas的dstRect区域
Demo
main.xml
===”@android:color/background_dark”android:orientation=”horizontal” ><ImageView=====”@drawable/baby” /><ImageView=====”@drawable/baby2″ /><Button===”Merge” /><ImageView===”@null” /></RelativeLayout>
目的就是将ivBmp1和ivBmp2上的图片，合并之后，，显示在iv_bmp_merger上
MainActivity.javapackage net.mobctrl.mergebitmap;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.os.Handler;import android.os.Handler.Callback;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;/** * * @author Zheng Haibo * @web * */{private ImageView ivBmp1;private ImageView ivBmp2;private ImageView ivBmpMerge;private Button mergeBtn;(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);initUi();}() {ivBmp1 = (ImageView) findViewById(R.id.iv_bmp1);ivBmp2 = (ImageView) findViewById(R.id.iv_bmp2);ivBmpMerge = (ImageView) findViewById(R.id.iv_bmp_merge);mergeBtn = (Button) findViewById(R.id.btn_merge);mergeBtn.setOnClickListener(new OnClickListener() {(View v) {showMergeBitmap();}});}private Handler handler = new Handler(new Callback() {(Message msg) {Bitmap bitmap = (Bitmap) msg.obj;ivBmpMerge.setImageBitmap(bitmap);return false;}});/*** 显示合并的图*/() {new Thread(new Runnable() {() {Bitmap bitmap = mergeBitmap();Message messge = handler.obtainMessage();messge.obj = bitmap;handler.sendMessage(messge);}}).start();}/** 使用Canvas合并Bitmap*/private Bitmap mergeBitmap() {// 获取ImageView上得Bitmap图片Bitmap bmp1 = ((BitmapDrawable) ivBmp1.getDrawable()).getBitmap();Bitmap bmp2 = ((BitmapDrawable) ivBmp2.getDrawable()).getBitmap();// 创建空得背景bitmap// 生成画布图像Bitmap resultBitmap = Bitmap.createBitmap(ivBmpMerge.getWidth(),ivBmpMerge.getHeight(), Bitmap.Config.RGB_565);Canvas canvas = new Canvas(resultBitmap);// 使用空白图片生成canvas// 将bmp1绘制在画布上Rect srcRect = new Rect(0, 0, bmp1.getWidth(), bmp1.getHeight());// 截取bmp1中的矩形区域Rect dstRect = new Rect(0, 0, ivBmpMerge.getWidth() / 2,ivBmpMerge.getHeight());// bmp1在目标画布中的位置canvas.drawBitmap(bmp1, srcRect, dstRect, null);// 将bmp2绘制在画布上srcRect = new Rect(0, 0, bmp2.getWidth(), bmp2.getHeight());// 截取bmp1中的矩形区域dstRect = new Rect(ivBmpMerge.getWidth() / 2, 0, ivBmpMerge.getWidth(),ivBmpMerge.getHeight());// bmp2在目标画布中的位置canvas.drawBitmap(bmp2, srcRect, dstRect, null);// 将bmp1,bmp2合并显示return resultBitmap;}}运行效果
点击merge之后
人的价值，在遭受诱-惑的一瞬间被决定
