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请帮我修复我的android应用程序。当我在模拟器中运行它时会发生这种情况。似乎找不到这些错误的答案。空指针异常。不能运行我的android应用程序
，这里是我的logcat
04-10 17:37:56.283: E/AndroidRuntime(2177): FATAL EXCEPTION: main
04-10 17:37:56.283: E/AndroidRuntime(2177): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.miraapp/com.example.miraapp.MainActivity}: java.lang.NullPointerException
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.os.Handler.dispatchMessage(Handler.java:99)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.os.Looper.loop(Looper.java:137)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-10 17:37:56.283: E/AndroidRuntime(2177): at java.lang.reflect.Method.invokeNative(Native Method)
04-10 17:37:56.283: E/AndroidRuntime(2177): at java.lang.reflect.Method.invoke(Method.java:511)
04-10 17:37:56.283: E/AndroidRuntime(2177): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-10 17:37:56.283: E/AndroidRuntime(2177): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-10 17:37:56.283: E/AndroidRuntime(2177): at dalvik.system.NativeStart.main(Native Method)
04-10 17:37:56.283: E/AndroidRuntime(2177): Caused by: java.lang.NullPointerException
04-10 17:37:56.283: E/AndroidRuntime(2177): at com.example.miraapp.MainActivity.onCreate(MainActivity.java:30)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.app.Activity.performCreate(Activity.java:5104)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-10 17:37:56.283: E/AndroidRuntime(2177): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-10 17:37:56.283: E/AndroidRuntime(2177): ... 11 more
这里是从主
package com.example.miraapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener
{
Button button1;
EditText etResponse;
TextView tvIsConnected;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(this);
}
private void button1Click()
{
startActivity(new Intent(this,GUI.class));
}
public void onClick(View v)
{
switch (v.getId())
{
case R.id.button1:
button1Click();
break;
case R.id.button2:
button2Click();
break;
}
}
private void button2Click()
{
}
};
这里我的MainActivity是我的manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.miraapp"
android:versionCode="1"
android:versionName="1.0"
>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="17"
/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.miraapp.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>
<activity
android:name="com.example.miraapp.GUI"
android:label="@string/app_name" >
</activity>
</application>
这里是我的fragment_main
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="#000000"
tools:context="com.example.miraapp.MainActivity$PlaceholderFragment" >
<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="131dp"
android:text="@string/START_fix"
android:onClick="button1Click"/>
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/button1"
android:layout_centerHorizontal="true"
android:layout_marginBottom="29dp"
android:contentDescription="@string/title_fix"
android:src="@drawable/mira4" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="63dp"
android:text="@string/CONNECT_fix" />
</RelativeLayout>
所以...这里是你的代码？ – Havenard
请为'MainActivity'发布'onCreate'方法以及代码的其他相关部分。并指出哪个是MainActivity.java的第30行。 –
发布相关布局xml也 – Raghunandan