content: package yifeiyuan.practice.practicedemos.camera;
  
  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.support.design.widget.FloatingActionButton;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  import android.util.Log;
  import android.view.View;
  import android.widget.ImageView;
  import android.widget.Toast;
  
  import java.io.File;
  import java.io.IOException;
  
  import yifeiyuan.practice.practicedemos.R;
  
  public class CameraActivity extends AppCompatActivity {
  
      public static final String TAG = "CameraActivity";
      private File mUriFile;
      private static final int CAMERA_PIC = 1;
      private static final int CROP_PIC = 2;
  
      private ImageView mIvResult;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_camera);
          Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
          setSupportActionBar(toolbar);
  
          FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
          fab.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  takePic();
  //                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
  //                        .setAction("Action", null).show();
              }
          });
  
          mIvResult = (ImageView) findViewById(R.id.iv_result);
  
      }
  
  
      private void takePic() {
          Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
          mUriFile = new File(Environment.getExternalStorageDirectory() + "/Download/" + System.currentTimeMillis());
          try {
              mUriFile.createNewFile();
          } catch (IOException e) {
              e.printStackTrace();
          }
          intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mUriFile));
          startActivityForResult(intent, CAMERA_PIC);
      }
  
  
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
          super.onActivityResult(requestCode, resultCode, data);
          Log.d(TAG, "onActivityResult() called with: " + "requestCode = [" + requestCode + "], resultCode = [" + resultCode + "], data = [" + data + "]");
          switch (requestCode) {
              case CAMERA_PIC:
                  cropPhoto(Uri.fromFile(mUriFile));
                  break;
              case CROP_PIC:
                 Bitmap obj =  data.getParcelableExtra("data");
                  if (null != obj) {
                      mIvResult.setImageBitmap(obj);
                  }else {
  //                    obj = BitmapFactory.decodeFile(mUriFile.getAbsolutePath());
  //                    if (null != obj) {
  //                        mIvResult.setImageBitmap(obj);
  //                    }
                      Uri uri = data.getData();
                      if (null != uri) {
                          Toast.makeText(CameraActivity.this, "URI 不为null" + uri.getPath(), Toast.LENGTH_SHORT).show();
                      }
                  }
                  break;
          }
      }
  
      private void cropPhoto(Uri uri) {
          Intent intent = new Intent("com.android.camera.action.CROP");
          intent.setDataAndType(uri, "image/*");
          intent.putExtra("crop", "true");
          intent.putExtra("aspectX", 1);
          intent.putExtra("aspectY", 1);
          intent.putExtra("outputX", 144);//5.1.1 两个outputX设置成一样就奔溃 坑爹啊
          intent.putExtra("outputY", 300);
          intent.putExtra("scale", true);
          intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
          intent.putExtra("return-data", true);
          intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
          intent.putExtra("noFaceDetection", true);
          startActivityForResult(intent, CROP_PIC);
      }
  
  }
  