廢話不多說,直接上程式碼
核心程式碼:

/**
 * 跳轉到系統裁剪圖片頁面
 * @param imagePath 需要裁剪的圖片路徑
 */
private void cropPic(String imagePath) {
    File file = new File(imagePath);
     Intent intent = new Intent("com.android.camera.action.CROP");
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
         intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
         Uri contentUri = FileProvider.getUriForFile(this
 
, "com.leon.crop.fileprovider", file);
         intent.setDataAndType(contentUri, "image/*");
     } else {
         intent.setDataAndType(Uri.fromFile(file), "image/*");
     }
     intent.putExtra("crop", "true");
     intent.putExtra("aspectX", 0.1);
     intent.putExtra("aspectY", 0.1);
     intent.putExtra("outputX"
 
, 150);
     intent.putExtra("outputY", 150);
     intent.putExtra("return-data", true);
     intent.putExtra("scale", true);
     startActivityForResult(intent, CROP_PHOTO);
 }

進入到裁剪頁面, 可以自由選擇裁剪的比例:

程式碼如下:

public class MainActivity extends AppCompatActivity {

    public final int CROP_PHOTO = 10
 
;
    public final int ACTION_TAKE_PHOTO = 20;
    private ImageView ivImage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //顯示圖片的imageview
        ivImage = (ImageView) findViewById(R.id.ivImage);
        //點選跳轉拍照
        findViewById(R.id.btnPhoto).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                takePhoto();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        File mPhotoFile = new File(getAppFile(this, "images/user_take.jpg"));
        switch (requestCode) {
            case CROP_PHOTO: //裁剪照片後
                if (data != null) {
                    Bitmap bitmap = data.getExtras().getParcelable("data");
                    ivImage.setImageBitmap(bitmap);
                }
                //裁剪後刪除拍照的照片
                if (mPhotoFile.exists()) {
                    //noinspection ResultOfMethodCallIgnored
                    mPhotoFile.delete();
                }
                break;
            case ACTION_TAKE_PHOTO:
                if (mPhotoFile.exists()) {
                    cropPic(getAppFile(this, "images/user_take.jpg"));
                }
                break;
        }
    }

    /**
     * 拍照
     */
    private void takePhoto() {
        try {
            Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
            File file = new File(getAppFile(this, "images"));
            File mPhotoFile = new File(getAppFile(this, "images/user_take.jpg"));
            if (!file.exists()) {
                file.mkdirs();
            }
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                Uri contentUri = FileProvider.getUriForFile(this, "com.pandaq.pandaeye.fileprovider", mPhotoFile);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, contentUri);
            } else {
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mPhotoFile));
            }
            startActivityForResult(intent, ACTION_TAKE_PHOTO);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 獲取本應用在系統的儲存目錄
     */
    public static String getAppFile(Context context, String uniqueName) {
        String cachePath;
        if ((Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                || !Environment.isExternalStorageRemovable())
                && context.getExternalCacheDir() != null) {
            cachePath = context.getExternalCacheDir().getParent();
        } else {
            cachePath = context.getCacheDir().getParent();
        }
        return cachePath + File.separator + uniqueName;
    }


    /**
     * 跳轉到系統裁剪圖片頁面
     * @param imagePath 需要裁剪的圖片路徑
     */
    private void cropPic(String imagePath) {
        File file = new File(imagePath);
        Intent intent = new Intent("com.android.camera.action.CROP");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            Uri contentUri = FileProvider.getUriForFile(this, "com.leon.crop.fileprovider", file);
            intent.setDataAndType(contentUri, "image/*");
        } else {
            intent.setDataAndType(Uri.fromFile(file), "image/*");
        }
        intent.putExtra("crop", "true");
        intent.putExtra("aspectX", 0.1);
        intent.putExtra("aspectY", 0.1);
        intent.putExtra("outputX", 150);
        intent.putExtra("outputY", 150);
        intent.putExtra("return-data", true);
        intent.putExtra("scale", true);
        startActivityForResult(intent, CROP_PHOTO);
    }
}