//简单的两个activity之间的跳转(不传递返回任何数据),由button触发,用手机调试时,只能打开EasyA2AActivity界面,但是按了按钮后就跳出“程序意外终止”
//EasyA2AActivity
public class EasyA2AActivity extends Activity {
    Button bntjump;
    TextView out;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        out=(TextView)this.findViewById(R.id.view);
        bntjump=(Button)this.findViewById(R.id.jump);
        out.setText("Fist_Activity");
        bntjump.setOnClickListener(new OnClickListener()
        {
public void onClick(View v) {
callactivity();
}
        });
    }
    void callactivity()
    {
     Intent i=new Intent(this,Second.class);
startActivity(i);
    }
}//Second
public class Second extends Activity {
Button bntfinsh;
public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        //this.setTitle("Second_Activity");
        bntfinsh.setOnClickListener(new OnClickListener()
        { @Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
        
        });
    }
}//main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <TextView
        android:id="@+id/view"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <Button
        android:id="@+id/jump"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="跳转" />
</LinearLayout>//second.xml
<?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" >
    <Button
        android:id="@+id/finsh"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="结束" />
</LinearLayout>//AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="your.A2A.xiaoyin"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk android:minSdkVersion="8" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".EasyA2AActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Second" >
        </activity>
    </application>
</manifest>

解决方案 »

  1.   

    第二个activity里面没有获取控件对象public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.second);
      //this.setTitle("Second_Activity");
      bntfinsh.setOnClickListener(new OnClickListener()
    bntfinsh  为空啊
      

  2.   

    Button bntfinsh;
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.second);
      //this.setTitle("Second_Activity");
    //这里少了
    bntfinsh = (Button)findviewbyid(R.id.xxx);
      bntfinsh.setOnClickListener(new OnClickListener()
      {