Button bt1=(Button)findViewById(R.id.Tbt01);
Button bt2=(Button)findViewById(R.id.Tbt02);
bt1.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        Toast.makeText(Toast0.this, "按钮1短提示",
            Toast.LENGTH_SHORT).show();
    }
});
bt2.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        Toast.makeText(Toast0.this, "按钮2长提示",
            Toast.LENGTH_LONG).show();
    }
});

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.dialog);
    bt = (Button) findViewById(R.id.Dbt);
    bt.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            Dialog dialog=new AlertDialog.Builder(Dialog0.this)
                .setTitle("警告")                        //设置标题
                .setMessage("股市有风险，投资需谨慎")    //显示信息
                .setIcon(R.drawable.go)                    //设置显示的图片
                .create();                                //创建Dialog
            dialog.show();            //显示对话框
        }
});

Dialog dialog2=new AlertDialog.Builder(Dialog0.this)
    .setTitle("退出")                        //设置标题
    .setMessage("是否退出程序？")        //显示信息
    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
                Dialog0.this.finish();    //退出程序
        }
    })
    .setNeutralButton("取消", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {}
    })
    .create();                            //创建Dialog
    dialog2.show();            //显示对话框

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate (savedInstanceState);
    setContendView(R.layout.dialog);        //设置布局管理器
    Button bt = (Button) findViewById (R.id.button);
    bt.setOnClickListener (new OnClickListener () {
        public void onClick (View v) {
            Dialog dialog2=new AlertDialog.Builder (Dialog0.this)
                .setTitle("删除")                        //设置标题
                .setMessage("是否删除指定内容？")        //显示信息
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                    }})
                .setNeutralButton("取消", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                    }})
                .create();                //创建Dialog
            dialog2.show();            //显示对话框
            }
        });
}

Button bt = (Button) findViewById(R.id.Dbt);
bt.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        final ProgressDialog pd=ProgressDialog.show(Dialog01.this,
             "搜索", "正在努力加载中。。。");
        new Thread(){                //线程对象
            public void run(){        //线程主体方法
                try {
                    Thread.sleep(3000);        //运行3秒后关闭对话框
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally{
                    pd.dismiss();    //关闭对话框
                }
             }
         }.start();                //线程启动
        pd.show();
     }
});

TextView tv=(TextView)findViewById(R.id.TV);
tv.setMovementMethod(ScrollingMovementMethod.getInstance());//滚动文本
SeekBar sb=(SeekBar)findViewById(R.id.seekbar);
sb.setOnSeekBarChangeListener(
        new OnSeekBarChangeListener() {    //设置操作监听
    public void onProgressChanged(SeekBar seekBar, int progress,
                 boolean fromUser) {
        tv.setText("当前进度"+progress);
     }
     public void onStartTrackingTouch(SeekBar seekBar) {
         tv.setText("正在拖动，当前值"+seekBar.getProgress());
     }
     public void onStopTrackingTouch(SeekBar seekBar) {
         tv.setText("停止拖动，当前值"+seekBar.getProgress());
     }
});