Android 学习笔记进阶十二之裁截图片

package xiaosi.cut;
import java.io.File;
import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;

public class CutActivity extends Activity {

    private static int SELECT_PICTURE;//返回标志位 filed
    private File tempFile;
    private Button button;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        this.tempFile = new File("/sdcard/song/a.jpg");
        button = new Button(this);
        button.setText("获取图片");
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
                intent.setType("image/*");
                intent.putExtra("crop", "true");// crop=true 有这句才能出来最后的裁剪页面.

                intent.putExtra("aspectX", 1);// 这两项为裁剪框的比例.
                intent.putExtra("aspectY", 2);// x:y=1:2

                intent.putExtra("output", Uri.fromFile(tempFile));
                intent.putExtra("outputFormat", "JPEG");//返回格式

                startActivityForResult(Intent.createChooser(intent, "选择图片"), SELECT_PICTURE);
            }
        });
        setContentView(button);
    }

    /**
     * 裁剪完图片后系统调用的方法:onActivityResult
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK)
            if (requestCode == SELECT_PICTURE)
                button.setBackgroundDrawable(Drawable.createFromPath(tempFile.getAbsolutePath()));
    }
}