Android实现拍照、选择相册图片并裁剪功能

通过拍照或相册中获取图片，并进行裁剪操作，然后把图片显示到ImageView上。
 当然也可以上传到服务器（项目中绝大部分情况是上传到服务器），参考网上资料及结合项目实际情况，
 测试了多款手机暂时没有发现严重问题。代码有注释，直接贴代码：

public class UploadPicActivity extends Activity implements View.OnClickListener {
 private Button take_photo_btn;
 private Button select_photo_btn;
 private ImageView photo_iv;
 //使用照相机拍照获取图片
 public static final int TAKE_PHOTO_CODE = 1;
 //使用相册中的图片
 public static final int SELECT_PIC_CODE = 2;
 //图片裁剪
 private static final int PHOTO_CROP_CODE = 3;
 //定义图片的Uri
 private Uri photoUri;
 //图片文件路径
 private String picPath;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_upload_pic);
  initViews();
 }

 private void initViews() {
  this.take_photo_btn = (Button) findViewById(R.id.take_photo_btn);
  this.take_photo_btn.setOnClickListener(this);
  this.select_photo_btn = (Button) findViewById(R.id.select_photo_btn);
  this.select_photo_btn.setOnClickListener(this);
  this.photo_iv = (ImageView) findViewById(R.id.photo_iv);
 }

 @Override
 public void onClick(View view) {
  switch (view.getId()) {
   //拍照
   case R.id.take_photo_btn:
    picTyTakePhoto();
    break;
   //选择图库
   case R.id.select_photo_btn:
    pickPhoto();
    break;
  }
 }

 /**
  * 拍照获取图片
  */
 private void picTyTakePhoto() {
  //判断SD卡是否存在
  String SDState = Environment.getExternalStorageState();
  if (SDState.equals(Environment.MEDIA_MOUNTED)) {
   Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//"android.media.action.IMAGE_CAPTURE"
/***
 * 使用照相机拍照，拍照后的图片会存放在相册中。使用这种方式好处就是：获取的图片是拍照后的原图，
 * 如果不实用ContentValues存放照片路径的话，拍照后获取的图片为缩略图有可能不清晰
 */
   ContentValues values = new ContentValues();
   photoUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
   intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, photoUri);
   startActivityForResult(intent, TAKE_PHOTO_CODE);
  } else {
   Toast.makeText(this, "内存卡不存在", Toast.LENGTH_LONG).show();
  }
 }

 /***
  * 从相册中取图片
  */
 private void pickPhoto() {
  Intent intent = new Intent(Intent.ACTION_PICK, null);
  intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
    "image/*");
  startActivityForResult(intent, SELECT_PIC_CODE);
 }

 @Override
 public void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if (resultCode == Activity.RESULT_OK) {
   //从相册取图片，有些手机有异常情况，请注意
   if (requestCode == SELECT_PIC_CODE) {
    if (null != data && null != data.getData()) {
     photoUri = data.getData();
     picPath = uriToFilePath(photoUri);
     startPhotoZoom(photoUri, PHOTO_CROP_CODE);
    } else {
     Toast.makeText(this, "图片选择失败", Toast.LENGTH_LONG).show();
    }
   } else if (requestCode == TAKE_PHOTO_CODE) {
    String[] pojo = {MediaStore.Images.Media.DATA};
    Cursor cursor = managedQuery(photoUri, pojo, null, null, null);
    if (cursor != null) {
     int columnIndex = cursor.getColumnIndexOrThrow(pojo[0]);
     cursor.moveToFirst();
     picPath = cursor.getString(columnIndex);
     if (Build.VERSION.SDK_INT < 14) {
      cursor.close();
     }
    }
    if (picPath != null) {
     photoUri = Uri.fromFile(new File(picPath));
     startPhotoZoom(photoUri, PHOTO_CROP_CODE);
    } else {
     Toast.makeText(this, "图片选择失败", Toast.LENGTH_LONG).show();
    }
   } else if (requestCode == PHOTO_CROP_CODE) {
    if (photoUri != null) {
     Bitmap bitmap = BitmapFactory.decodeFile(picPath);
     if (bitmap != null) {
      //这里可以把图片进行上传到服务器操作
      photo_iv.setImageBitmap(bitmap);
     }
    }
   }
  }
 }

 /**
  * @param
  * @description 裁剪图片
  * @author ldm
  * @time 2016/11/30 15:19
  */
 private void startPhotoZoom(Uri uri, int REQUE_CODE_CROP) {
  Intent intent = new Intent("com.android.camera.action.CROP");
  intent.setDataAndType(uri, "image/*");
  // crop=true是设置在开启的Intent中设置显示的VIEW可裁剪
  intent.putExtra("crop", "true");
  // 去黑边
  intent.putExtra("scale", true);
  intent.putExtra("scaleUpIfNeeded", true);
  // aspectX aspectY 是宽高的比例，根据自己情况修改
  intent.putExtra("aspectX", 3);
  intent.putExtra("aspectY", 2);
  // outputX outputY 是裁剪图片宽高像素
  intent.putExtra("outputX", 600);
  intent.putExtra("outputY", 400);
  intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
  //取消人脸识别功能
  intent.putExtra("noFaceDetection", true);
  //设置返回的uri
  intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
  //设置为不返回数据
  intent.putExtra("return-data", false);
  startActivityForResult(intent, REQUE_CODE_CROP);
 }

 /**
  * @param
  * @description 把Uri转换为文件路径
  * @author ldm
  * @time 2016/11/30 15:22
  */
 private String uriToFilePath(Uri uri) {
  //获取图片数据
  String[] proj = {MediaStore.Images.Media.DATA};
  //查询
  Cursor cursor = managedQuery(uri, proj, null, null, null);
  //获得用户选择的图片的索引值
  int image_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
  cursor.moveToFirst();
  //返回图片路径
  return cursor.getString(image_index);
 }
}

布局文件长这样：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

 <Button
  android:id="@+id/take_photo_btn"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginTop="20dp"
  android:gravity="center"
  android:text="拍照"
  android:textSize="16sp"/>

 <Button
  android:id="@+id/select_photo_btn"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginTop="20dp"
  android:gravity="center"
  android:text="选择图片"
  android:textSize="16sp"/>

 <ImageView
  android:id="@+id/photo_iv"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"
  android:layout_marginTop="20dp"/>
</LinearLayout>

最后不要忘记在AndroidManifest.xml中添加UploadPicActivity及权限：

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission
 android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

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