Android Camera拍照 压缩

http://www.linuxidc.com/Linux/2014-12/110924.htm

package com.klp.demo_025;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

    private ImageView iv;
    private Button button;
    private File file;
    private Uri uri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iv = (ImageView) findViewById(R.id.imageView1);
        button = (Button) findViewById(R.id.button1);

        file = new File(this.getExternalFilesDir(null), "image.jpg");
        uri = Uri.fromFile(file);

        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.Images.Media.ORIENTATION, 0);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
                startActivityForResult(intent, 2);
            }
        });

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            if (requestCode == 2) {
                startPhotoZoom(uri);
            } else {
                try {
                    BitmapFactory.Options options = new BitmapFactory.Options();
                    options.inSampleSize = 2;
                    Bitmap bitmap = BitmapFactory.decodeFile(file.getPath(),
                            options);
                    // 压缩图片
//                    bitmap = compressImage(bitmap,500);

                    if (bitmap != null) {
                        // 显示图片
                        iv.setImageBitmap(bitmap);
                        // 保存图片
                        FileOutputStream fos = null;
                        fos = new FileOutputStream(file);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
                        fos.flush();
                        fos.close();
                    }
                } catch (Exception e) {
                    // TODO: handle exception

                }
            }

        }

    }

    /**
    * 裁剪图片
    *
    * @param uri
    */
    public void startPhotoZoom(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "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", 1);// x:y=1:1
        intent.putExtra("outputX", 200);//图片输出大小
        intent.putExtra("outputY", 200);
        intent.putExtra("output", uri);
        intent.putExtra("outputFormat", "JPEG");// 返回格式
        startActivityForResult(intent, 3);
    }

    /**
    * 将图片image压缩成大小为 size的图片（size表示图片大小，单位是KB）
    *
    * @param image
    *            图片资源
    * @param size
    *            图片大小
    * @return Bitmap
    */
    private Bitmap compressImage(Bitmap image, int size) {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        // 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        int options = 100;
        // 循环判断如果压缩后图片是否大于100kb,大于继续压缩
        while (baos.toByteArray().length / 1024 > size) {
            // 重置baos即清空baos
            baos.reset();
            // 每次都减少10
            options -= 10;
            // 这里压缩options%，把压缩后的数据存放到baos中
            image.compress(Bitmap.CompressFormat.JPEG, options, baos);

        }
        // 把压缩后的数据baos存放到ByteArrayInputStream中
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
        // 把ByteArrayInputStream数据生成图片
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);
        return bitmap;
    }

}