我正在嘗試使用 Bitmap 和 Bitmap 顯示 ImageView 從 sharedpref 路徑中獲取它的值 /// 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);**我的日志中沒有任何錯(cuò)誤，但問題是 ImageView 沒有顯示 Bitmap 我還檢查了共享首選項(xiàng)是否正確獲取了路徑值我的代碼中是否有任何邏輯錯(cuò)誤??？有什么問題 ？
2 回答
largeQ
TA貢獻(xiàn)2039條經(jīng)驗(yàn) 獲得超8個(gè)贊
如果您將文件路徑存儲(chǔ)在 SharedPrefence 中，那么您可以使用其路徑將文件解碼為位圖。
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);
藍(lán)山帝景
TA貢獻(xiàn)1843條經(jīng)驗(yàn) 獲得超7個(gè)贊
要從路徑中獲取位圖，您需要使用下面的代碼
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);
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