1 import android.content.Intent;
  2 import android.graphics.Bitmap;
  3 import android.net.Uri;
  4 import android.os.Bundle;
  5 import android.os.Environment;
  6 import android.provider.MediaStore;
  7 import android.support.v7.app.AppCompatActivity;
  8 import android.view.View;
  9 import android.widget.Button;
 10 import android.widget.ImageView;
 11 import android.widget.Toast;
 12 import java.io.File;
 13 
 14 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 15     private Button buttonLocal, buttonCamera;
 16     private ImageView imageView;
 17     //相机拍摄的头像文件(本次演示存放在SD卡根目录下)
 18     private static final File USER_ICON = new File(Environment.getExternalStorageDirectory(), "user_icon.jpg");
 19     //请求识别码(分别为本地相册、相机、图片裁剪)
 20     private static final int CODE_PHOTO_REQUEST = 1;
 21     private static final int CODE_CAMERA_REQUEST = 2;
 22     private static final int CODE_PHOTO_CLIP = 3;
 23     @Override
 24     protected void onCreate(Bundle savedInstanceState) {
 25         super.onCreate(savedInstanceState);
 26         setContentView(R.layout.activity_main);
 27         buttonLocal = (Button) findViewById(R.id.buttonLocal);
 28         buttonCamera = (Button) findViewById(R.id.buttonCamera);
 29         imageView = (ImageView) findViewById(R.id.imageView);
 30         buttonLocal.setOnClickListener(this);
 31         buttonCamera.setOnClickListener(this);
 32     }
 33     //设置点击事件
 34     @Override
 35     public void onClick(View view) {
 36         switch (view.getId()) {
 37             case R.id.buttonLocal:
 38                 //调用获取本地图片的方法
 39                 getPicFromLocal();
 40                 break;
 41             case R.id.buttonCamera:
 42                 //调用相机拍照的方法
 43                 getPicFromCamera();
 44                 break;
 45             default:
 46                 break;
 47         }
 48     }
 49     /**
 50      * 从本机相册获取图片
 51      */
 52     private void getPicFromLocal() {
 53         Intent intent = new Intent();
 54         // 获取本地相册方法一
 55         intent.setAction(Intent.ACTION_GET_CONTENT);
 56         intent.setType("image/*");
 57         //获取本地相册方法二
 58 //        intent.setAction(Intent.ACTION_PICK);
 59 //        intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
 60 //                "image/*");
 61         startActivityForResult(intent, CODE_PHOTO_REQUEST);
 62     }
 63     /**
 64      * 通过相机拍摄获取图片，
 65      * 并存入设置的路径中
 66      */
 67     private void getPicFromCamera() {
 68         Intent intent = new Intent();
 69         intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
 70         // 下面这句指定调用相机拍照后的照片存储的路径
 71         intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(USER_ICON));
 72         startActivityForResult(intent, CODE_CAMERA_REQUEST);
 73     }
 74     /**
 75      * 图片裁剪
 76      *
 77      * @param uri
 78      */
 79     private void photoClip(Uri uri) {
 80         // 调用系统中自带的图片剪裁
 81         Intent intent = new Intent();
 82         intent.setAction("com.android.camera.action.CROP");
 83         intent.setDataAndType(uri, "image/*");
 84         // 下面这个crop=true是设置在开启的Intent中设置显示的VIEW可裁剪
 85         intent.putExtra("crop", "true");
 86         // aspectX aspectY 是宽高的比例
 87         intent.putExtra("aspectX", 1);
 88         intent.putExtra("aspectY", 1);
 89         /*outputX outputY 是裁剪图片宽高
 90          *这里仅仅是头像展示，不建议将值设置过高
 91          * 否则超过binder机制的缓存大小的1M限制
 92          * 报TransactionTooLargeException
 93          */
 94         intent.putExtra("outputX", 150);
 95         intent.putExtra("outputY", 150);
 96         intent.putExtra("return-data", true);
 97         startActivityForResult(intent, CODE_PHOTO_CLIP);
 98     }
 99     /**
100      * 提取保存裁剪之后的图片数据，并设置头像部分的View
101      */
102     private void setImageToHeadView(Intent intent) {
103         Bundle extras = intent.getExtras();
104         if (extras != null) {
105             Bitmap photo = extras.getParcelable("data");
106             imageView.setImageBitmap(photo);
107         }
108     }
109     @Override
110     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
111         // 用户没有进行有效的设置操作，返回
112         if (resultCode == RESULT_CANCELED) {
113             Toast.makeText(MainActivity.this, "取消", Toast.LENGTH_LONG).show();
114             return;
115         }
116         switch (requestCode) {
117             case CODE_CAMERA_REQUEST:
118                 if (USER_ICON.exists()) {
119                     photoClip(Uri.fromFile(USER_ICON));
120                 }
121                 break;
122             case CODE_PHOTO_REQUEST:
123                 if (data != null) {
124                     photoClip(data.getData());
125                 }
126                 break;
127             case CODE_PHOTO_CLIP:
128                 if (data != null) {
129                     setImageToHeadView(data);
130                 }
131                 break;
132         }
133         super.onActivityResult(requestCode, resultCode, data);
134     }
135 }