android之SeekBar控件用法详解

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>