这是我的 LogCat 的日志。
07-04 06:47:46.012: E/AndroidRuntime(2885): FATAL EXCEPTION: main
07-04 06:47:46.012: E/AndroidRuntime(2885): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.goodnight.ppt/com.goodnight.ppt.BoardActivity_wow}: java.lang.NullPointerException
这是主要活动代码。
package com.goodnight.ppt;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
@SuppressWarnings("deprecation")
public class BoardActivity_main extends TabActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.board_main);
TabHost tabHost = getTabHost();
//LOL tap
Intent intent1;
intent1 = new Intent().setClass(this, BoardActivity_lol.class);
TabSpec sp1 = tabHost.newTabSpec("Tab1");
sp1.setIndicator("LOL");
sp1.setContent(intent1);
tabHost.addTab(sp1);
//WOW tap
Intent intent2;
intent2 = new Intent().setClass(this, BoardActivity_wow.class);
TabSpec sp2 = tabHost.newTabSpec("Tab2");
sp2.setIndicator("WOW");
sp2.setContent(intent2);
tabHost.addTab(sp2);
//STAR tap
Intent intent3;
intent3 = new Intent().setClass(this, BoardActivity_star.class);
TabSpec sp3 = tabHost.newTabSpec("Tab3");
sp3.setIndicator("STAR");
sp3.setContent(intent3);
tabHost.addTab(sp3);
//WIND tap
Intent intent4;
intent4= new Intent().setClass(this, BoardActivity_wind.class);
TabSpec sp4 = tabHost.newTabSpec("Tab4");
sp4.setIndicator("WIND");
sp4.setContent(intent4);
tabHost.addTab(sp4);
}
}
主要活动的 xml 文件。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TabHost
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
</FrameLayout>
</TabHost>
</LinearLayout>
这是其他活动(BoardActivity_wow)..
package com.goodnight.ppt;
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;
public class BoardActivity_wow extends Activity implements OnClickListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.board_wow);
Button writeButton_wow = new Button(this);
writeButton_wow = (Button)findViewById(R.id.bbb);
writeButton_wow.setOnClickListener(this);
}
public void onClick(View v){
Intent wow = new Intent(this, BoardActivity_wow_write.class);
startActivity(wow);
}
}
BoardrActivity_wow 的 xml 文件。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="bottom"
android:orientation="vertical" >
<Button
android:id="@+id/boardWrite_lol"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Write_lol" />
</LinearLayout>
boardactivity_wow_write 活动..
package com.goodnight.ppt;
import android.app.Activity;
import android.os.Bundle;
public class BoardActivity_wow_write extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.board_wow_write);
}
}
BoardActivity_wow_write 的 xml 文件..
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="bottom"
android:orientation="vertical" >
<EditText
android:id="@+id/title_wow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10" />
<EditText
android:id="@+id/content_wow"
android:layout_width="match_parent"
android:layout_height="250dp"
android:ems="10"
android:inputType="textMultiLine" >
</EditText>
<Button
android:id="@+id/bbb"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="boardWrite_wow" />
</LinearLayout>
你好,
当我运行这个应用程序时,强制停止。我猜这个错误的原因是 OnClickListener。删除 OnClickListener,此应用程序已运行。但我必须需要 OnClickListener ...