zxing掃描後出現 FAILED BINDER TRANSACTION
阿新 • • 發佈:2019-01-30
今天在進行 zxing 二維碼掃描時,出現 FAILED BINDER TRANSACTION,心裡那叫一個不爽。
細看了下程式碼,因為之前寫的掃描的程式碼,掃描框有些小,於是修改了zxing包下 camera 包下的 CameraManager 類的 getFramingRect 方法,原 getFramingRect 中是
private static final int MIN_FRAME_WIDTH = 240; private static final int MIN_FRAME_HEIGHT = 240; private static final int MAX_FRAME_WIDTH = 480; private static final int MAX_FRAME_HEIGHT = 360;
public Rect getFramingRect() { Point screenResolution = configManager.getScreenResolution(); if (framingRect == null) { if (camera == null) { return null; } int width = screenResolution.x * 3 / 4; if (width < MIN_FRAME_WIDTH) { width = MIN_FRAME_WIDTH; } else if (width > MAX_FRAME_WIDTH) { width = MAX_FRAME_WIDTH; } int height = screenResolution.y * 3 / 4; if (height < MIN_FRAME_HEIGHT){ height = MIN_FRAME_HEIGHT; } else if (height > MAX_FRAME_HEIGHT) { height = MAX_FRAME_HEIGHT; } int leftOffset = (screenResolution.x - width) / 2; int topOffset = (screenResolution.y - height) / 2; framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height); Log.d(TAG, "Calculated framing rect: " + framingRect); } return framingRect; }
這樣的話,掃描是可以的,也能返回結果,但是由於預覽框太小,於是 改 getFramingRect() 方法如下:
public Rect getFramingRect() { Point screenResolution = configManager.getScreenResolution(); if (framingRect == null) { if (mCamera == null) { return null; } int width = screenResolution.x * 3 / 4; // int width = screenResolution.x * 4 / 5; // if (width < MIN_FRAME_WIDTH) { // width = MIN_FRAME_WIDTH; // } else if (width > MAX_FRAME_WIDTH) { // width = MAX_FRAME_WIDTH; // } int height = screenResolution.y * 44 / 99; // if (height < MIN_FRAME_HEIGHT) { // height = MIN_FRAME_HEIGHT; // } else if (height > MAX_FRAME_HEIGHT) { // height = MAX_FRAME_HEIGHT; // } int leftOffset = (screenResolution.x - width) / 2; int topOffset = screenResolution.y * 24 / 102; framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height); Log.d(TAG, "Calculated framing rect: " + framingRect); } return framingRect; }
結果看
public void handleDecode(Result result, Bitmap barcode) {
inactivityTimer.onActivity();
playBeepSoundAndVibrate();
// 在介面可見時閃光燈可以繼續開啟
// isOpen = false;
// contralLight();
String resultString = result.getText();
if (resultString.equals("")) {
Toast.makeText(ScanActivity.this, "無效二維碼", Toast.LENGTH_SHORT).show();
} else {
Intent resultIntent = new Intent();
Bundle bundle = new Bundle();
bundle.putString("result", resultString);
// bundle.putParcelable("bitmap", barcode);
resultIntent.putExtras(bundle);
this.setResult(RESULT_OK, resultIntent);
}
AppManager.getInstance().closeActivity(ScanActivity.this);
}
方法中返回的結果 : resultString 的值是有的,但程式卡在這個介面不能動,log裡面顯示:FAILED BINDER TRANSACTION,於是上網各種查,終於找到原因:
Android中使用Intent進行傳遞資料時出現:E/JavaBinder﹕ !!! FAILED BINDER TRANSACTION !!!錯誤資訊,例如傳遞一個大的Bitmap物件時。
這種情況是因為系統對Intent傳遞資料有大小限制。
原來是我將預覽框變大後,掃描獲得的 bitmap 也就大了,在 intent' 傳輸的時候,受到大小的限制,於是出現 FAILED BINDER TRANSACTION,由於我呼叫掃描的時候不需要bitmap,所以我在傳輸的時候把 bundle.putParcelable("bitmap", barcode);註釋掉了,大家如果需要傳輸 bitmap的話,記得在放入 intent之前,對 bitmap的大小做一下處理