package com.example.imagescale; import android.os.Bundle; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends Activity { private ImageView iv1,iv2; private Button bt,bt2,bt3,bt4; private Bitmap bp; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); iv1=(ImageView)this.findViewById(R.id.imageView1); iv2=(ImageView)this.findViewById(R.id.imageView2); bt=(Button)this.findViewById(R.id.button1); bt2=(Button)this.findViewById(R.id.button2); bt3=(Button)this.findViewById(R.id.button3); bt4=(Button)this.findViewById(R.id.button4); bt.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub bp = BitmapFactory.decodeResource(getResources(), R.drawable.xh); //iv1.setImageBitmap(bp); //对照图片 //以bp在高、宽决定Canvas画布的大小 Bitmap bp2 = Bitmap.createBitmap(bp.getWidth(), bp.getHeight(), bp.getConfig());// Canvas canvas = new Canvas(bp2); Paint paint = new Paint(); paint.setColor(Color.BLACK); Matrix matrix = new Matrix(); matrix.setScale(0.5f, 1); canvas.drawBitmap(bp, matrix, paint); iv2.setImageBitmap(bp2); } }); bt2.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub bp = BitmapFactory.decodeResource(getResources(), R.drawable.xh); //iv1.setImageBitmap(bp); //对照图片 //以bp在高、宽决定Canvas画布的大小 Bitmap bp2 = Bitmap.createBitmap(bp.getWidth(), bp.getHeight(), bp.getConfig());// Canvas canvas = new Canvas(bp2); Paint paint = new Paint(); paint.setColor(Color.BLACK); Matrix matrix = new Matrix(); matrix.setScale(1, -1); matrix.postTranslate(0, bp.getHeight()); canvas.drawBitmap(bp, matrix, paint); iv2.setImageBitmap(bp2); } }); bt3.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub bp = BitmapFactory.decodeResource(getResources(), R.drawable.xh); //iv1.setImageBitmap(bp); //对照图片 //以bp在高、宽决定Canvas画布的大小 Bitmap bp2 = Bitmap.createBitmap(bp.getWidth(), bp.getHeight(), bp.getConfig());// Canvas canvas = new Canvas(bp2); Paint paint = new Paint(); paint.setColor(Color.BLACK); Matrix matrix = new Matrix(); matrix.setRotate(90, bp.getWidth()/2, bp.getHeight()/2); canvas.drawBitmap(bp, matrix, paint); iv2.setImageBitmap(bp2); } }); bt4.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub bp = BitmapFactory.decodeResource(getResources(), R.drawable.xh); //iv1.setImageBitmap(bp); //对照图片 //以bp在高、宽决定Canvas画布的大小 Bitmap bp2 = Bitmap.createBitmap(bp.getWidth(), bp.getHeight(), bp.getConfig());// Canvas canvas = new Canvas(bp2); Paint paint = new Paint(); paint.setColor(Color.BLACK); Matrix matrix = new Matrix(); matrix.setTranslate(100, 100); canvas.drawBitmap(bp, matrix, paint); iv2.setImageBitmap(bp2); } }); //原始图片 //bp = BitmapFactory.decodeResource(getResources(), R.drawable.xh); //iv1.setImageBitmap(bp); //对照图片 //以bp在高、宽决定Canvas画布的大小 //Bitmap bp2 = Bitmap.createBitmap(bp.getWidth(), bp.getHeight(), bp.getConfig());// //Canvas canvas = new Canvas(bp2); //Paint paint = new Paint(); //paint.setColor(Color.BLACK); //Matrix matrix = new Matrix(); //1.缩放 //方法一：使用矩阵 /*matrix.setValues(new float[]{ 0.5f,0,0, 0,1,0, 0,0,1 });*/ //方法二： //matrix.setScale(0.5f, 1); //2.旋转 //以图片左上角为中心旋转 //matrix.setRotate(15); //以图片中心旋转 //matrix.setRotate(90, bp.getWidth()/2, bp.getHeight()/2); //消除锯齿 //paint.setAntiAlias(true); //3.平移 //matrix.setTranslate(50, 50); //4.镜子效果 //matrix.setScale(-1, 1); //matrix.postTranslate(bp.getWidth(), 0); //5.倒影效果 //matrix.setScale(1, -1); //matrix.postTranslate(0, bp.getHeight()); //canvas.drawBitmap(bp, matrix, paint); //iv2.setImageBitmap(bp2); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
执行效果图：
