barcodefraglibv2以片段为黑屏启动

时间:2016-05-18 22:27:48

标签: android barcode

我正在试验zxing barcodefraglibv2。我将它作为一个模块导入,经过多次失败后,我开始了一个新项目并编译了提供的示例活动。我最终得到的结果与我在样本周围建立的样本相同 - 应用程序启动但是应该有准备扫描的相机屏幕,我得到一个黑屏。在我的logcat中,我收到此错误:连接到摄像头时出错:0,以及通常的数据转储。如果有人需要,我很乐意提供整个转储。我试过在Nexus 5和Nexus 7上运行该设备。再次,这是随包提供的代码,所以我不知道发生了什么。

感谢您的帮助。

MainActivity:

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;

import com.abhi.barcode.frag.libv2.BarcodeFragment;
import com.abhi.barcode.frag.libv2.IScanResultHandler;
import com.abhi.barcode.frag.libv2.ScanResult;

public class MainActivity extends AppCompatActivity implements IScanResultHandler {
BarcodeFragment brf;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.activity_main);
    FragmentTransaction trx = getSupportFragmentManager().beginTransaction();
    brf = new BarcodeFragment();
    trx.add(R.id.testFragmentHolder, brf, "HOLDER");
    trx.commit();
    //brf = (BarcodeFragment) getSupportFragmentManager().findFragmentById(R.id.barcodeFragment);
    brf.setDecodeFor(MODE.ONE_D_MODE);
    brf.setScanResultHandler(this);
}

@Override
public void scanResult(ScanResult result) {
    Toast.makeText(this, result.getRawResult().getText(), Toast.LENGTH_LONG).show();
    try{
        brf.restart();
    }catch (Exception e) {
        e.printStackTrace();
    }
}
}

XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/testFragmentHolder"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.valdes.fuckingbarcode.MainActivity" >

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="198dp"
    android:text="Scan" />

<fragment
    android:id="@+id/barcodeFragment"
    android:name="com.abhi.barcode.frag.libv2.BarcodeFragment"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/button1"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="24dp" />

</RelativeLayout>

清单:

<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.valdes.barcode">


<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<!-- Don't require camera, as this requires a rear camera. This allows it to work on the Nexus 7 -->
<uses-feature
    android:name="android.hardware.camera"
    android:required="false" />
<uses-feature
    android:name="android.hardware.camera.front"
    android:required="false" />
<!-- TODO replace above two with next line after Android 4.2 -->
<!-- <uses-feature android:name="android.hardware.camera.any"/> -->
<uses-feature
    android:name="android.hardware.camera.autofocus"
    android:required="false" />
<uses-feature
    android:name="android.hardware.camera.flash"
    android:required="false" />
<uses-feature android:name="android.hardware.screen.landscape" />
<uses-feature
    android:name="android.hardware.wifi"
    android:required="false" />

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

1 个答案:

答案 0 :(得分:0)

想出来。 API 23需要在运行时请求权限。两个修复:

1)在运行时请求延迟。你可以在这里阅读:https://developer.android.com/training/permissions/requesting.html

2)在API 22编译。

仍有一些问题,但这是对这一特定问题的解决方法。