Android开发实现图片平移、缩放、倒影及旋转功能的方法
本文实例讲述了Android开发实现图片平移、缩放、倒影及旋转功能的方法。分享给大家供大家参考，具体如下：
解析：
1）根据原来的图片创建新的图片
BitmapmodBm=Bitmap.createBitmap(bm.getWidth()+20,bm.getHeight()+20,bm.getConfig());
2）设置到画布
Canvascanvas=newCanvas(modBm);
3）使用矩阵进行平移…
Matrixmatrix=newMatrix(); matrix.setRotate(90,bm.getWidth()/2,bm.getHeight()/2);
4）把改变后图片设置到
canvas.drawBitmap(bm,matrix,paint); imageView2.setImageBitmap(modBm);
示例代码：
1、平移：
publicclassTranslateImageActivityextendsActivity{
privateImageViewimageView1;
privateImageViewimageView2;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_rotate);
initViews();
}
privatevoidinitViews(){
imageView1=(ImageView)findViewById(R.id.imageView1);
imageView2=(ImageView)findViewById(R.id.imageView2);
Bitmapbm=BitmapFactory.decodeResource(getResources(),R.drawable.mm0);
imageView1.setImageBitmap(bm);
BitmapmodBm=Bitmap.createBitmap(bm.getWidth()+20,bm.getHeight()+20,bm.getConfig());
Canvascanvas=newCanvas(modBm);
Paintpaint=newPaint();
paint.setColor(Color.BLACK);
paint.setAntiAlias(true);
Matrixmatrix=newMatrix();
//matrix.setRotate(90,bm.getWidth()/2,bm.getHeight()/2);
matrix.setTranslate(20,20);
matrix.postTranslate(20,20);
canvas.drawBitmap(bm,matrix,paint);
imageView2.setImageBitmap(modBm);
}
}
2、缩放
publicclassScaleImageActivityextendsBaseActivity{
privatestaticfinalintDOUBLE=2;
privateImageViewiv1,iv2;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scale_iamge);
iv1=(ImageView)findViewById(R.id.imageView1);
iv2=(ImageView)findViewById(R.id.imageView2);
Bitmapb1=BitmapFactory.decodeResource(getResources(),R.drawable.p1);
iv1.setImageBitmap(b1);
Bitmapb2=Bitmap.createBitmap(b1.getWidth()*DOUBLE,b1.getHeight(),Config.ARGB_8888);
Canvascanvas=newCanvas(b2);
Matrixmatrix=newMatrix();
matrix.setValues(newfloat[]{
DOUBLE*1.0f,0,0,//x
0,1.0f,0,//y
0,0,1.0f//z
});
canvas.drawBitmap(b1,matrix,newPaint());
iv2.setImageBitmap(b2);
}
}
3、倒影
publicclassShadeImageActivityextendsActivity{
privateImageViewimageView1;
privateImageViewimageView2;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_rotate);
initViews();
}
privatevoidinitViews(){
imageView1=(ImageView)findViewById(R.id.imageView1);
imageView2=(ImageView)findViewById(R.id.imageView2);
Bitmapbm=BitmapFactory.decodeResource(getResources(),R.drawable.mm3);
imageView1.setImageBitmap(bm);
BitmapmodBm=Bitmap.createBitmap(bm.getWidth(),bm.getHeight(),bm.getConfig());
Canvascanvas=newCanvas(modBm);
Paintpaint=newPaint();
paint.setColor(Color.BLACK);
paint.setAntiAlias(true);
Matrixmatrix=newMatrix();
//matrix.setRotate(90,bm.getWidth()/2,bm.getHeight()/2);
//matrix.setTranslate(20,20);
//镜子效果
matrix.setScale(1,-1);
matrix.postTranslate(0,bm.getHeight());
canvas.drawBitmap(bm,matrix,paint);
imageView2.setImageBitmap(modBm);
}
}
4、旋转
publicclassRotateImageActivityextendsActivity{
privateImageViewimageView1;
privateImageViewimageView2;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_rotate);
initViews();
}
privatevoidinitViews(){
imageView1=(ImageView)findViewById(R.id.imageView1);
imageView2=(ImageView)findViewById(R.id.imageView2);
Bitmapbm=BitmapFactory.decodeResource(getResources(),R.drawable.mm0);
imageView1.setImageBitmap(bm);
BitmapmodBm=Bitmap.createBitmap(bm.getWidth(),bm.getHeight(),bm.getConfig());
Canvascanvas=newCanvas(modBm);
Paintpaint=newPaint();
paint.setColor(Color.BLACK);
paint.setAntiAlias(true);
Matrixmatrix=newMatrix();
matrix.setRotate(90,bm.getWidth()/2,bm.getHeight()/2);
canvas.drawBitmap(bm,matrix,paint);
imageView2.setImageBitmap(modBm);
}
}
希望本文所述对大家Android程序设计有所帮助。