好的，所以我正在为我的公司开发一种内部条形码扫描仪，以便在我们移动计算机和设备时使用。经过一些试验和错误后，我目前几乎通过 Intent 设置 Zxing 条码扫描仪。
这就是我想要做的。
在三个字段旁边，EditText我有三个ImageButtons，当单击时，实现BarcodeScanner, 一旦扫描返回值并将值输入到EditText字段中。我能够使用一个对应于一个的“听众”成功地做到这一点ImageButton。但是在尝试对Buttons一个侦听器使用多个之后，它会调用条形码扫描仪，但在尝试返回条形码值时会崩溃。
RuntimeException调试器显示主线程已暂停，我必须在 Logcat 中出现错误之前恢复调试器两次。
这是来自 LogCat 的错误日志：
07-17 17:38:49.251：E/AndroidRuntime(30942)：java.lang.RuntimeException：无法恢复活动 {com.fmi.inventory/com.fmi.inventory.MainActivity}：java.lang.RuntimeException：交付失败结果 ResultInfo{who=null, request=49374, result=-1, data=Intent { act=com.google.zxing.client.android.SCAN flg=0x80000 (has extras) }} 到活动 {com.fmi.inventory /com.fmi.inventory.MainActivity}：java.lang.NullPointerException
这是我的主要活动：
package com.fmi.inventory;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
public class MainActivity extends Activity {
ImageButton button;
ImageButton button1;
ImageButton button2;
EditText editField;
Activity activity;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
activity = this;
button = (ImageButton)findViewById(R.id.scanCubeID);
button1 = (ImageButton)findViewById(R.id.scanEmployeeID);
button2 = (ImageButton)findViewById(R.id.scanConfigID);
button.setOnClickListener(listener);
button1.setOnClickListener(listener);
button2.setOnClickListener(listener);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
public void onResume() {
super.onResume();
}
public void setCubeClick(){
editField = (EditText)findViewById(R.id.editCubeID);
}
public void setEmployeeClick(){
editField = (EditText)findViewById(R.id.editEmployeeID);
}
public void setConfigClick(){
editField = (EditText)findViewById(R.id.editConfigID);
}
private View.OnClickListener listener = new View.OnClickListener() {
public void onClick(View v) {
IntentIntegrator integrator = new IntentIntegrator(activity);
integrator.initiateScan();
}
};
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
switch (requestCode) {
case IntentIntegrator.REQUEST_CODE:
if (resultCode == Activity.RESULT_OK) {
IntentResult intentResult = IntentIntegrator
.parseActivityResult(requestCode, resultCode, intent);
if (intentResult != null) {
String contents = intentResult.getContents();
String format = intentResult.getFormatName();
this.editField.setText(contents);
// this.elemQuery.setText(contents);
//this.resume = false;
Log.d("SEARCH_EAN", "OK, EAN: " + contents + ", FORMAT: "
+ format);
} else {
Log.e("SEARCH_EAN", "IntentResult je NULL!");
}
} else if (resultCode == Activity.RESULT_CANCELED) {
Log.e("SEARCH_EAN", "CANCEL");
}
}
}
}
这是我的 MainActivity 布局 .xml
<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" >
<EditText
android:id="@+id/editCubeID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/scanEmployeeID"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/scanCubeID"
android:ems="10"
android:hint="@string/edit_cubeid" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/editEmployeeID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/scanConfigID"
android:layout_alignParentLeft="true"
android:layout_alignRight="@+id/editCubeID"
android:layout_below="@+id/editCubeID"
android:ems="10"
android:hint="@string/edit_employeeid" />
<EditText
android:id="@+id/editConfigID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/scanConfigID"
android:layout_alignParentLeft="true"
android:layout_alignRight="@+id/editEmployeeID"
android:layout_below="@+id/editEmployeeID"
android:ems="10"
android:hint="@string/edit_configid" />
<ImageButton
android:id="@+id/scanCubeID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:contentDescription="@string/desc"
android:layout_alignParentTop="true"
android:src="@drawable/ic_action_scan"
android:onClick="onClick" />
<ImageButton
android:id="@+id/scanEmployeeID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:contentDescription="@string/desc"
android:layout_below="@+id/scanCubeID"
android:src="@drawable/ic_action_scan"
android:onClick="onClick" />
<ImageButton
android:id="@+id/scanConfigID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:contentDescription="@string/desc"
android:layout_below="@+id/scanEmployeeID"
android:src="@drawable/ic_action_scan"
android:onClick="onClick" />
<Button
android:id="@+id/submit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editConfigID"
android:text="@string/button_continue" />
</RelativeLayout>