

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class Main extends Activity implements OnClickListener, Runnable{
private Handler handler;
private TextView sCount;
private int count=0;
@Override//创建方法
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button sStart=(Button)findViewById(R.id.sStart);
Button sStop=(Button)findViewById(R.id.sStop);
Button showToast=(Button)findViewById(R.id.showToast);
sCount=(TextView)findViewById(R.id.sCount);
sStart.setOnClickListener(this);
sStop.setOnClickListener(this);
showToast.setOnClickListener(this);
handler=new Handler();
}
//吐丝显示
class RunToast implements Runnable{
private Context context;
public RunToast(Context context) {
this.context = context;
}
@Override
public void run() {//根据时间去显示内容
Toast.makeText(context, "15秒后显示信息内容", Toast.LENGTH_LONG).show();
}
}
@Override//事件点击
public void onClick(View v) {
switch (v.getId())
{
case R.id.sStart:
handler.postDelayed(this, 5000);
break;
case R.id.sStop:
handler.removeCallbacks(this);
break;
case R.id.showToast:
handler.postAtTime(new RunToast(this)
{
}, android.os.SystemClock.uptimeMillis() + 15 * 1000);
break;
}
}
@Override//线程运行
public void run() {
sCount.setText("Count: "+String.valueOf(++count));//显示计数:
handler.postDelayed(this, 5000);
}
}
main.xml
<?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"
>
<TextView
android:id="@+id/sCount"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/sStart"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="开始计数"
/>
<Button
android:id="@+id/sStop"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="停止计数"
/>
<Button
android:id="@+id/showToast"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="15秒后显示Toast信息"
/>
</LinearLayout>