SeekBar控件可以通过拖动滑竿改变当前的值,可以利用SeekBar来设置有一定范围的变量的值。
一、建立工程,如图
二、activity_main.xml中代码
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/textview1" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/textview2" android:layout_width="match_parent" android:layout_height="wrap_content" /> <SeekBar android:id="@+id/seekbar1" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="100" android:progress="30" /> <SeekBar android:id="@+id/seekbar2" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="100" android:progress="30" android:secondaryProgress="60" /> </LinearLayout>
三、MainActivity.java中代码
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package com.study.seeekbar; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.widget.TextView; public class MainActivity extends Activity implements OnSeekBarChangeListener{ private TextView textView1,textView2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView1 = (TextView)this.findViewById(R.id.textview1); textView2 = (TextView)this.findViewById(R.id.textview2); SeekBar seekBar1 = (SeekBar)this.findViewById(R.id.seekbar1); SeekBar seekBar2 = (SeekBar)this.findViewById(R.id.seekbar2); seekBar1.setOnSeekBarChangeListener(this); seekBar2.setOnSeekBarChangeListener(this); } @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; } //当滑动滑竿的时候,会触发的事件 @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { if(seekBar.getId() == R.id.seekbar1){ textView1.setText("seekbar1的当前位置是:" + progress); }else { textView2.setText("seekbar2的当前位置是:" + progress); } } //表示从哪里开始拖动 @Override public void onStartTrackingTouch(SeekBar seekBar) { if(seekBar.getId() == R.id.seekbar1){ textView1.setText("seekbar1开始拖动"); }else { textView2.setText("seekbar2开始拖动"); } } //表示从哪里结束拖动 @Override public void onStopTrackingTouch(SeekBar seekBar) { if(seekBar.getId() == R.id.seekbar1){ textView1.setText("seekbar1停止拖动"); }else { textView2.setText("seekbar2停止拖动"); } } }
四、效果图
拖动时可以看到值!