应用程序未启动。找不到错误

时间：2014-03-15 11:38:18

标签： java android eclipse logcat

我的问题是，在我在模拟器上启动我的应用程序后，它写了＃34;不幸的是，appname已停止＆＃34;。 Eclipse并没有表明存在任何错误。我知道我可以用LogCat以某种方式修复它们，但不幸的是我对eclipse完全不熟悉，我不确定如何做到这一点。所以请告诉我，我的错误是什么，以及如何解决它们。

logcat的

03-15 07:18:55.620: D/AndroidRuntime(795): Shutting down VM
03-15 07:18:55.620: W/dalvikvm(795): threadid=1: thread exiting with uncaught exception (group=0xb3aa4ba8)
03-15 07:18:55.700: E/AndroidRuntime(795): FATAL EXCEPTION: main
03-15 07:18:55.700: E/AndroidRuntime(795): Process: com.gosha.bux, PID: 795
03-15 07:18:55.700: E/AndroidRuntime(795): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gosha.bux/com.gosha.bux.MainActivity}: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.access$800(ActivityThread.java:135)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.os.Handler.dispatchMessage(Handler.java:102)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.os.Looper.loop(Looper.java:136)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.main(ActivityThread.java:5017)
03-15 07:18:55.700: E/AndroidRuntime(795):  at java.lang.reflect.Method.invokeNative(Native Method)
03-15 07:18:55.700: E/AndroidRuntime(795):  at java.lang.reflect.Method.invoke(Method.java:515)
03-15 07:18:55.700: E/AndroidRuntime(795):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-15 07:18:55.700: E/AndroidRuntime(795):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-15 07:18:55.700: E/AndroidRuntime(795):  at dalvik.system.NativeStart.main(Native Method)
03-15 07:18:55.700: E/AndroidRuntime(795): Caused by: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button
03-15 07:18:55.700: E/AndroidRuntime(795):  at com.gosha.bux.MainActivity.onCreate(MainActivity.java:21)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.Activity.performCreate(Activity.java:5231)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-15 07:18:55.700: E/AndroidRuntime(795):  ... 11 more
03-15 07:18:55.700: E/AndroidRuntime(795): FATAL EXCEPTION: main
03-15 07:18:55.700: E/AndroidRuntime(795): Process: com.gosha.bux, PID: 795
03-15 07:18:55.700: E/AndroidRuntime(795): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gosha.bux/com.gosha.bux.MainActivity}: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.access$800(ActivityThread.java:135)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.os.Handler.dispatchMessage(Handler.java:102)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.os.Looper.loop(Looper.java:136)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.main(ActivityThread.java:5017)
03-15 07:18:55.700: E/AndroidRuntime(795):  at java.lang.reflect.Method.invokeNative(Native Method)
03-15 07:18:55.700: E/AndroidRuntime(795):  at java.lang.reflect.Method.invoke(Method.java:515)
03-15 07:18:55.700: E/AndroidRuntime(795):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-15 07:18:55.700: E/AndroidRuntime(795):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-15 07:18:55.700: E/AndroidRuntime(795):  at dalvik.system.NativeStart.main(Native Method)
03-15 07:18:55.700: E/AndroidRuntime(795): Caused by: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button
03-15 07:18:55.700: E/AndroidRuntime(795):  at com.gosha.bux.MainActivity.onCreate(MainActivity.java:21)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.Activity.performCreate(Activity.java:5231)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-15 07:18:55.700: E/AndroidRuntime(795):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-15 07:18:55.700: E/AndroidRuntime(795):  ... 11 more

清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gosha.bux"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="18" />

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

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

主要

package com.gosha.bux;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
int counter;
Button first;
TextView t;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    first = (Button)findViewById(R.id.button1);
    t= (TextView)findViewById(R.id.textView1);
    counter = 0;
    first.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
             //TODO Auto-generated method stub
    counter = counter+1;
    t.setText("heeey"+counter);
        }
    }) ;

}}

5 个答案:

答案 0 :(得分：2)

ComponentInfo{com.gosha.bux/com.gosha.bux.MainActivity}: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button

解决方案1： 用ImageButton替换Button 

ImageButton first = (ImageButton)findViewById(R.id.button1);

解决方案2： 在您的布局中，使用Button更改ImageButton。

答案 1 :(得分：1)

如果您想要ImageButton，请更改 - 

ImageButton first;
first = (ImageButton) findViewById(R.id.button1);

如果你想要简单的按钮然后改变 -

ImageButton进入xml文件中的Button。

答案 2 :(得分：0)

尝试：

ImageButton first = (ImageButton)findViewById(R.id.button1);

如果这不起作用，请尝试刷新项目。

答案 3 :(得分：0)

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gosha.bux/com.gosha.bux.MainActivity}: java.lang.ClassCastException: android.widget.ImageButton cannot be cast to android.widget.Button

建议您将ImageButton投射到Button。您的R.id.button1类型ImageButton是否有可能？

您必须使用

ImageButton first = (ImageButton)findViewById(R.id.button1);

答案 4 :(得分：0)

更改此代码

  Button first;
 setContentView(R.layout.activity_main);
first = (Button)findViewById(R.id.button1);

到

ImageButton first;
 setContentView(R.layout.activity_main);
first = (ImageButton)findViewById(R.id.button1);
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