android应用常见错误

一、错误：Unknown host api.tudou.com, throwing UnknownHostException。

解决办法：在AndroidManifest.xml中添加<uses-permission android:name="android.permission.INTERNET" />

二、Unable to find explicit activity class have you declared this activity in your AndroidManifest.xml?

解决办法：在AndroidManifest.xml的application段添加声明：<activity android:name=".ActivityName" />,详情见：
http://stackoverflow.com/questions/736571/using-intent-in-an-android-application-to-show-another-activity
三、ListActivity setContentView错误：

代码及相关xml如下：

main.xml:

<ListView android:id="@+id/list"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:drawSelectorOnTop="false"/>

tudouPlayer.java:

public class tudouPlayer extends ListActivity implements
OnClickListener {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

}

}

编译不会报错，运行时，adb打出来的错误为：

E/AndroidRuntime( 701): java.lang.RuntimeException: Unable to start
activity
ComponentInfo{com.java.tudouPlayer/com.java.tudouPlayer.tudouPlayer}:
java.lang.RuntimeException: Your content must have a ListView whose id
attribute is 'android.R.id.list'

解决办法：

将main.xml中，上面贴出来的那段改为（原因见注释）：

<!-- Here is the list. Since we are using a ListActivity,
we

have to call it "@android:id/list" so ListActivity will

find it -->

<ListView android:id="@android:id/list"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:drawSelectorOnTop="false"/>