android之SeekBar控件用法

MainActivity.java

package com.example.mars_2400_seekbar;import android.support.v7.app.ActionBarActivity;import android.support.v7.app.ActionBar;import android.support.v4.app.Fragment;import android.app.Activity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.TextView;import android.os.Build;public class MainActivity extends Activity implements OnSeekBarChangeListener {    private TextView tv;    private SeekBar sb;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv = (TextView) findViewById(R.id.textView1);        sb = (SeekBar) findViewById(R.id.seekbar);        sb.setOnSeekBarChangeListener(this);    }    @Override    public void onProgressChanged(SeekBar seekBar, int progress,            boolean fromUser) {        // TODO Auto-generated method stub        tv.setText("Progress is " + progress                + (fromUser ? " Trigger" : " Nontrigger") + " by user.");    }

　　　　@Override
　　　　public void onStartTrackingTouch(SeekBar seekBar) {
　　　　　　// TODO Auto-generated method stub
　　　　　　System.out.println("onStart-->"+seekBar.getProgress());
　　　　}

　　　　@Override
　　　　public void onStopTrackingTouch(SeekBar seekBar) {
　　　　　　// TODO Auto-generated method stub
　　　　　　System.out.println("onStop-->"+seekBar.getProgress());
　　　　}

    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

activity_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:layout_width="fill_parent"    android:layout_height="wrap_content"    android:id="@+id/textView1"/><SeekBar android:id="@+id/seekbar"    android:layout_width="fill_parent"    android:layout_height="wrap_content"/> </LinearLayout>

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