好的,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,我目前几乎都是通过Intent设置Zxing条码扫描器。
这是我正在尝试做的事情。
在三个EditText
字段旁边,我有三个ImageButtons
,点击后,实施BarcodeScanner
,扫描后返回值并将值输入EditText
字段。我能够使用一个与ImageButton
对应的“监听器”成功完成。但在尝试将多个Buttons
与一个侦听器一起使用后,它会调用条形码扫描程序,但在尝试返回条形码值时会崩溃。
调试器显示主线程已挂起,我必须在Logcat中出现RuntimeException
错误之前两次恢复调试器。
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:传递结果失败 ResultInfo {who = null,request = 49374,result = -1,data = Intent { act = com.google.zxing.client.android.SCAN flg = 0x80000(有额外内容)}} 活动{com.fmi.inventory / com.fmi.inventory.MainActivity}: 显示java.lang.NullPointerException
这是我的MainActivity:
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>
答案 0 :(得分:1)
扫描后Activity
进入onActivityResult
。您正在访问editField
,但 NULL 。
因为你从未初始化它..
您正在setCubeClick
,setEmployeeClick
或setConfigClick
初始化它们,
但我很害怕他们从未打过电话。试着Initialize
{/ 1}} OnCreat