Android实现拍照及图片裁剪（6.0以上权限处理及7.0以上文件管理）

最近做项目中涉及到了图片相关功能 ，在使用安卓6.0手机及7.1手机拍照时，遇到了因权限及文件管理导致程序崩溃等问题。
 刚好把功能修改完，把代码简单地贴一下，方便以后使用。

—-主界面 代码 ——

public class MainActivity extends AppCompatActivity {
  //拍照按钮
  private Button take_photo;
  //显示裁剪后的图片
  private ImageView photo_iv;
  private static final int PERMISSIONS_FOR_TAKE_PHOTO = 10;
  //图片文件路径
  private String picPath;
  //图片对应Uri
  private Uri photoUri;
  //拍照对应RequestCode
  public static final int SELECt_PIC_BY_TACK_PHOTO = 1;
  //裁剪图片
  private static final int CROP_PICTURE = 3;


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    take_photo = (Button) findViewById(R.id.take_photo);
    photo_iv = (ImageView) findViewById(R.id.photo_iv);
    take_photo.setonClickListener(new View.onClickListener() {
      @Override
      public void onClick(View view) {
 //小于6.0版本直接操作
 if (Build.VERSION.SDK_INT < 23) {
   takePictures();
 } else {
   //6.0以后权限处理
   permissionForM();
 }
      }
    });
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == Activity.RESULT_OK) {
      if (requestCode == SELECT_PIC_BY_TACK_PHOTO) {
 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 && (picPath.endsWith(".png") || picPath.endsWith(".PNG") || picPath.endsWith(".jpg") || picPath.endsWith(".JPG"))) {
   photoUri = Uri.fromFile(new File(picPath));
   if (Build.VERSION.SDK_INT > 23) {
     photoUri = FileProvider.getUriForFile(this, "com.innopro.bamboo.fileprovider", new File(picPath));
     cropForN(picPath, CROP_PICTURE);
   } else {
     startPhotoZoom(photoUri, CROP_PICTURE);
   }
 } else {
   //错误提示
 }
      }
      if (requestCode == CROP_PICTURE) {
 if (photoUri != null) {
   Bitmap bitmap = BitmapFactory.decodeFile(picPath);
   if (bitmap != null) {
     photo_iv.setImageBitmap(bitmap);
   }
 }
      }
    }
  }

  
  private void takePictures() {
    //执行拍照前，应该先判断SD卡是否存在
    String SDState = Environment.getExternalStorageState();
    if (SDState.equals(Environment.MEDIA_MOUNTED)) {
      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
      ContentValues values = new ContentValues();
      photoUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
      intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
      startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO);
    } else {
      Toast.makeText(this, "手机未插入内存卡", Toast.LENGTH_LONG).show();
    }
  }


  
  private void startPhotoZoom(Uri uri,
  int REQUE_CODE_CROP) {
    int dp = 500;
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image
  private void cropForN(String imagePath, int REQUE_CODE_CROP) {
    Uri cropUri = getImageContentUri(new File(imagePath));
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(cropUri, "image
  private void permissionForM() {
    if (ContextCompat.checkSelfPermission(this,
 Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this,
 Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this,
 Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

      ActivityCompat.requestPermissions(this,
   new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},
   PERMISSIONS_FOR_TAKE_PHOTO);
    } else {
      takePictures();
    }
  }

  @Override
  public void onRequestPermissionsResult(int requestCode,
 @NonNull String[] permissions, @NonNull int[] grantResults) {

    if (requestCode == PERMISSIONS_FOR_TAKE_PHOTO) {
      if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
 takePictures();
      }
      return;
    }
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
  }

}

–主界面布局——–

–AndroidManifest.xml添加provider——–

–资源文件下添加xml文件夹及file_paths文件——–

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。