Pavel Bobkov..

5

我在Samsung Galaxy Grand 2(Android 4)上遇到了同樣的問題，并且找到了一個解決方案。啟動相機之前，我禁用了自動對焦功能。1-2秒后，我啟用了它。我嘗試了幾種方法，并決定定期切換自動對焦功能。為了實現這一點，我創建了util類-FocusHandler。

public class FocusHandler implements Runnable{

private final int FOCUS_OFF_TIME = 2000;

private final int FOCUS_ON_TIME = 20000;

private boolean flag = false;

private boolean state = false;

private Handler handler;

private WeakReference scannerView;

public FocusHandler(Handler handler, ZXingScannerView scannerView){

this.handler = handler;

this.flag = false;

this.scannerView = new WeakReference<>(scannerView);

}

public void start(){

state = true;

this.handler.post(this);

}

public void stop(){

state = false;

scannerView.clear();

}

@Override

public void run() {

if (!state || this.scannerView.get() == null){

return;

}

int time;

if (!flag){

this.scannerView.get().setAutoFocus(flag);

time = FOCUS_OFF_TIME;

}

else{

this.scannerView.get().setAutoFocus(flag);

time = FOCUS_ON_TIME;

}

flag = !flag;

handler.postDelayed(this, time);

}

}

/ ***************活動****************** /

private ZXingScannerView scannerView;

private FocusHandler focusHandler;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_scanner);

scannerView = new ZXingScannerView(this);

focusHandler = new FocusHandler(new Handler(), scannerView);

frameLayout.addView(scannerView);

}

@Override

protected void onResume() {

super.onResume();

scannerView.setResultHandler(this);

scannerView.setAutoFocus(false);

scannerView.startCamera();

focusHandler.start();

}

@Override

public void onPause() {

super.onPause();

scannerView.stopCamera();

focusHandler.stop();

}

總結

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