[android] 08_图片平移

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图片平移
matrix.setTranslate(30, 0);//平移的像素
核心代码：
package com.itheima.pickimg;
 
import java.io.FileNotFoundException;
 
import android.app.Activity;
import android.content.Intent;
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.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
 
public class MainActivity extends Activity {
    private ImageView iv;
    private ImageView iv_after;
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iv  = (ImageView) findViewById(R.id.iv);
        iv_after = (ImageView) findViewById(R.id.iv_after);
    }
 
    public void selectImage(View view){
        Intent intent = new Intent();
        intent.setAction("android.intent.action.PICK");
        intent.setType("image/*");
        intent.addCategory(Intent.CATEGORY_DEFAULT);
        startActivityForResult(intent, 0);
    }
 
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(data!=null){
            //获取要查看的图片的路径
            try {
                Uri uri = data.getData();
                iv.setImageURI(uri);
                //得到原图的bitmap  只读
                Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
                //空白可可以修改的bitmap
                Bitmap alterBitmap = Bitmap.createBitmap(bitmap.getWidth()+30, bitmap.getHeight(), bitmap.getConfig());
 
                //创建画布
                Canvas canvas = new Canvas(alterBitmap);
                //创建画笔
                Paint paint = new Paint();
                paint.setColor(Color.BLACK);
                Matrix matrix = new Matrix();
 
                matrix.setTranslate(30, 0);//平移的像素
                canvas.drawBitmap(bitmap, matrix, paint);
 
                iv_after.setImageBitmap(alterBitmap);
 
            } catch (Exception e) {
                e.printStackTrace();
            }
 
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
}
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