图像视图不显示位图

Question

我正在尝试使用位图显示ImageView，位图从sharedpref路径获取其值

/// Activity Fields
ٍString mWinPhotoPath, mLosePhotoPath;
ImageView winnerImage, loserImage;
Bitmap winImage, loseImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_winner);
//// Get shared pref values
mWinPhotoPath = **sharedPreferences.getString(getString(R.string.sharedPreferences_winner_pic), getString(R.string.error_sorry_message));  // win pic
mLosePhotoPath = sharedPreferences.getString(getString(R.string.sharedPreferences_loser_pic), getString(R.string.error_sorry_message)); // lose pic**

**winImage = BitmapFactory.decodeFile(mWinPhotoPath);
loseImage = BitmapFactory.decodeFile(mLosePhotoPath);**

// Activity Objects
**winnerImage = findViewById(R.id.winner_image);**
**loserImage = findViewById(R.id.loser_image);**
// set values

**winnerImage.setImageBitmap(winImage);**
**loserImage.setImageBitmap(loseImage);**

我的日志中没有任何错误，但问题是ImageView没有显示位图我还检查了共享的pref是否正确地获得了路径值

我的代码中有逻辑错误吗！！？怎么了

Answer 1

要从路径获取位图，需要在下面使用此代码

File image = new File(mWinPhotoPath, imageName);
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(),bmOptions);
winImage = Bitmap.createScaledBitmap(bitmap,parent.getWidth(),parent.getHeight(),true);

Answer 2

如果您将文件的路径存储在SharedPreference中，则可以使用其路径将文件解码为位图。

File f = new File(file path....);
Bitmap map = BitmapFactory.decodeFile(f.getAbsolutePath());
image.setImageBitmap(map);

或

String fileName = "...."; // file path
File completeFile = new File(fileName);
FileInputStream readPicture = new FileInputStream(completeFile);
BufferedInputStream bf = new BufferedInputStream(readPicture);
Bitmap bitmap = BitmapFactory.decodeStream(bf);