在 Android 中从一项活动转移到另一项活动

以下是我的代码。请告诉我我做错了什么？

 package version.nitt;

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.LinearLayout;
 import version.nitt.R;
 import android.util.Log;
 import android.content.Intent;

 public class versionActivity extends Activity {
private Runnable runnable;
private static final String TAG="WElcome!";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.startscreen);

    runnable= new Runnable(){
        public void run()
        {
            try
            {
                 Log.v(TAG,"Going to sleep...");  
                Thread.sleep(1000);
                 Log.v(TAG,"Waking up from sleep...");  
            }
            catch(Exception e1)
            {
            }
        }
    };
    try
    {
        Thread t=new Thread(null,runnable);
        t.start();
        final Intent i=new Intent(versionActivity.this,secondActivity.class);
        LinearLayout lin =(LinearLayout) findViewById(R.id.ll);
        lin.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v)
            {
                 finish();
                 startActivity(i);
            }

        });

    }
    catch(Exception e)
    {

    }


        Button button = (Button) findViewById(R.id.cls);
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                finish();
                System.exit(0);
            }
      });




 }
}

如果用户单击屏幕上的任意位置，我会尝试从一项活动移动到另一项活动。线性布局设置为可点击。应用程序被加载。但是，当执行 onClick 以进入下一个活动时，应用程序将被强制关闭。

Log Cat:

08-05 14:46:37.028: I/Process(1883): Sending signal. PID: 1883 SIG: 9
08-05 14:46:51.479: D/dalvikvm(1915): GC_FOR_ALLOC freed 31K, 4% free 6342K/6595K, paused 64ms
08-05 14:46:51.499: I/dalvikvm-heap(1915): Grow heap (frag case) to 7.279MB for 1080016-byte allocation
08-05 14:46:51.650: D/dalvikvm(1915): GC_FOR_ALLOC freed <1K, 4% free 7396K/7687K, paused 59ms
08-05 14:46:51.819: D/dalvikvm(1915): GC_CONCURRENT freed <1K, 4% free 7396K/7687K, paused 4ms+13ms
08-05 14:46:52.019: D/dalvikvm(1915): GC_FOR_ALLOC freed <1K, 4% free 7396K/7687K, paused 57ms
08-05 14:46:52.031: I/dalvikvm-heap(1915): Grow heap (frag case) to 7.737MB for 480016-byte allocation
08-05 14:46:52.162: D/dalvikvm(1915): GC_FOR_ALLOC freed 0K, 5% free 7865K/8199K, paused 65ms
08-05 14:46:52.439: D/dalvikvm(1915): GC_CONCURRENT freed 1054K, 17% free 6813K/8199K, paused 10ms+5ms
08-05 14:46:52.840: D/dalvikvm(1915): GC_CONCURRENT freed 351K, 15% free 6973K/8199K, paused 8ms+6ms
08-05 14:46:52.840: V/WElcome!(1915): Going to sleep...
08-05 14:46:53.838: V/WElcome!(1915): Waking up from sleep...
08-05 14:47:03.398: D/AndroidRuntime(1915): Shutting down VM
08-05 14:47:03.398: W/dalvikvm(1915): threadid=1: thread exiting with uncaught exception (group=0x40014760)
08-05 14:47:03.428: E/AndroidRuntime(1915): FATAL EXCEPTION: main
08-05 14:47:03.428: E/AndroidRuntime(1915): android.content.ActivityNotFoundException: Unable to find explicit activity class {version.nitt/version.nitt.secondActivity}; have you declared this activity in your AndroidManifest.xml?
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1504)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1382)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.app.Activity.startActivityForResult(Activity.java:3131)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.app.Activity.startActivity(Activity.java:3237)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at version.nitt.versionActivity$2.onClick(versionActivity.java:46)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.view.View.performClick(View.java:3110)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.view.View$PerformClick.run(View.java:11934)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.os.Handler.handleCallback(Handler.java:587)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.os.Looper.loop(Looper.java:132)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at android.app.ActivityThread.main(ActivityThread.java:4123)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at java.lang.reflect.Method.invokeNative(Native Method)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at java.lang.reflect.Method.invoke(Method.java:491)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
08-05 14:47:03.428: E/AndroidRuntime(1915):     at dalvik.system.NativeStart.main(Native Method)

lin.setOnClickListener(new OnClickListener()
{
    public void onClick(View v)
    {

       Intent i = new Intent(versionActivity.this, secondActivity.class);     
       startActivity(i);
       finish(); //should use the finish if you need to preserve memory
                 //other wise don't use it.
    }

});

第二步：AndroidManifest.xml

<activity  android:name=".secondActivity">
     <intent-filter>
        <action android:name="android.intent.action.MAIN" />                   
     </intent-filter>
</activity>