android TextView 如何实现消息滚动

第一步：layout文件，主要是红色部分

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:weightSum="1">

<LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">

</LinearLayout>

</ScrollView>

</LinearLayout>

第二部：Java文件

package com.exam;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.widget.ScrollView;

public class ExampleActivity extends Activity {
/** Called when the activity is first created. */

private ScrollView scrollview;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

scrollview = (ScrollView) findViewById(R.id.scrollView);
scrollview.setVerticalScrollBarEnabled(false);
LooperThread mClockThread = new LooperThread();
mClockThread.start();

}

// 用于线程间通信的Handler
class TestHandler extends Handler {
public TestHandler(Looper looper) {
super(looper);
}

@Override
public void handleMessage(Message msg) {

Bundle bundle = msg.getData();
int loop = bundle.getInt("loop");
System.out.println("loop:" + loop);
if (loop == 4)
scrollview.scrollTo(0, 0);// 改变滚动条的位置
else
scrollview.scrollTo(loop * 29, loop * 29 + 30 + loop * 1);// 改变滚动条的位置
super.handleMessage(msg);
}
}

//多线程控制循环

class LooperThread extends Thread {

public void run() {
super.run();
try {
int loop = 0;
while (true) {
Thread.sleep(3000);
Message msg = new Message();
Bundle bundle = new Bundle();
bundle.putInt("loop", loop);
msg.setData(bundle);
new TestHandler(Looper.getMainLooper()).sendMessage(msg);
loop++;
if (loop == 5) {
loop = 0;
}
}

} catch (InterruptedException e) {
e.printStackTrace();
}

}
}

}

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