ImageView 不显示位图

Question

我正在尝试使用 Bitmap 和 Bitmap 显示 ImageView 从 sharedpref 路径中获取它的值 /// 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 Bitmap 我还检查了共享首选项是否正确获取了路径值我的代码中是否有任何逻辑错误！？有什么问题 ？

Answer 1

如果您将文件路径存储在 SharedPrefence 中，那么您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);

或者

            String fileName = "...."; // file path

            File completeFile = new File(fileName);

            FileInputStream readPicture = new FileInputStream(completeFile);

            BufferedInputStream bf = new BufferedInputStream(readPicture);

            Bitmap bitmap = BitmapFactory.decodeStream(bf);

Answer 2

要从路径中获取位图，您需要使用下面的代码

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);