今天和大家讲解SeekBar

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="match_parent"
    android:layout_height="match_parent">

    <SeekBar android:id="@+id/seek"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="50"
        android:secondaryProgress="75" />

    <TextView android:id="@+id/progress"
       	android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView android:id="@+id/tracking"
       	android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

package com.sun;


import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;

public class MainActivity extends Activity implements SeekBar.OnSeekBarChangeListener {
    
    SeekBar mSeekBar;
    TextView mProgressText;
    TextView mTrackingText;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);
        
        mSeekBar = (SeekBar)findViewById(R.id.seek);
        mSeekBar.setOnSeekBarChangeListener(this);
        mProgressText = (TextView)findViewById(R.id.progress);
        mTrackingText = (TextView)findViewById(R.id.tracking);
    }
    //进度条改变就会触发这个
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
        mProgressText.setText(progress + " " + 
        		"from touch" + "=" + fromTouch);
    }
    //进度条点中了
    public void onStartTrackingTouch(SeekBar seekBar) {
        mTrackingText.setText("Tracking on");
    }
//进度条没有焦点了
    public void onStopTrackingTouch(SeekBar seekBar) {
        mTrackingText.setText("Tracking off");
    }
}