拍照（一）和相册中得到裁剪图片

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/take_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Take Photo" />

    <Button
        android:id="@+id/get_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="get Photo" />

    <ImageView
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal" />

</LinearLayout>

package com.example.choosepictest;

import java.io.File;
import java.io.IOException;

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

public class MainActivity extends Activity implements OnClickListener {

    public static final int TAKE_PHOTO = 1;
    public static final int CROP_PHOTO = 2;
    public static final int GET_PHOTO = 3;
    private Button takePhoto;
    private Button getPhoto;
    private ImageView picture;
    private Uri headImgUri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        takePhoto = (Button) findViewById(R.id.take_photo);
        getPhoto = (Button) findViewById(R.id.get_photo);
        picture = (ImageView) findViewById(R.id.picture);
        takePhoto.setOnClickListener(this);
        getPhoto.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.take_photo:
            takePhoto();
            break;
        case R.id.get_photo:
            getPhoto();
            break;
        default:
            break;
        }

    }

    // 拍照
    private void takePhoto() {
        File appDir = new File(Environment.getExternalStorageDirectory(),
                "/etoury/picCache");

        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = "user_head" + ".jpg";
        File outputImage = new File(appDir, fileName);

        try {
            if (outputImage.exists()) {
                outputImage.delete();
            }
            outputImage.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }

        headImgUri = Uri.fromFile(outputImage);
        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        intent.putExtra(MediaStore.EXTRA_OUTPUT, headImgUri);
        startActivityForResult(intent, TAKE_PHOTO);
    }

    // 定向到图片库
    private void getPhoto() {
        Intent intent = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, GET_PHOTO);
    }

    /**
     * 裁剪
     */
    private void crop(Uri uri) {

        // 裁剪图片意图
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
        // 下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪
        intent.putExtra("crop", "true");
        intent.putExtra("scale", true);// 去黑边
        // 裁剪框的比例，1：1
        intent.putExtra("aspectX", 1);// 输出是X方向的比例
        intent.putExtra("aspectY", 1);
        // 裁剪后输出图片的尺寸大小,不能太大500程序崩溃
        intent.putExtra("outputX", 256);
        intent.putExtra("outputY", 256);

        // 图片格式
        /* intent.putExtra("outputFormat", "JPEG"); */
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());

        // intent.putExtra("noFaceDetection", true);// 取消人脸识别
        intent.putExtra("return-data", true);// true:返回uri，false：不返回uri

        // 同一个地址下 裁剪的图片覆盖拍照的图片
        intent.putExtra(MediaStore.EXTRA_OUTPUT, headImgUri);

        startActivityForResult(intent, CROP_PHOTO);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
        case GET_PHOTO:
            if (resultCode == RESULT_OK) {
                crop(data.getData());
            }
            break;
        case TAKE_PHOTO:
            if (resultCode == RESULT_OK) {
                crop(headImgUri);
            }
            break;
        case CROP_PHOTO:
            if (resultCode == RESULT_OK) {
                Bitmap cropbitmap = data.getParcelableExtra("data");
                picture.setImageBitmap(cropbitmap);
            }
            break;
        default:
            break;
        }
    }

}

总结：

1.  拍照返回一张图片，可以是全尺寸的图片

2.  拍照返回图片的地址问题，一个目录下的一个文件

3. 裁剪的图片的地址， 覆盖了全尺寸图片的地址

4. 相册intent 返回的是一个uir , 不是string

5. 裁剪的图片，不能覆盖相册返回的uri(一定注意)