好久没有更新博客了！在滑动SeekBar的时候，要同时显示进度，而且通常要求最小值比0小，按照惯例，先看看效果图：
这里写图片描述
这里写图片描述
一、自定义控件 用于在SeekBar上方，跟随SeekBar一块移动的控件显示进度
package la.trytry.seekbar;
import android.content.Context;
import android.util.AttributeSet;
import android.view.ViewGroup;
/**
* @author: lijuan
* @description:
* @date: 2017-05-31
* @time: 17:49
*/
public class CustomLayout extends ViewGroup {
public CustomLayout(Context context) {
super(context);
}
public CustomLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public CustomLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
}
}
二、MainActivity，代码很简单！稍微看下就懂的了~
package la.trytry.seekbar;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.ViewGroup;
import android.widget.SeekBar;
import android.widget.TextView;
public class MainActivity extends Activity {
private SeekBar seekbar = null;
private int startValue = 0;
private int endValue = 100;
private int totalValue;
private TextView text, mTvStartValue, mTvEndValue;
private int screenWidth;//屏幕宽度
private CustomLayout textMoveLayout;//自定义随着拖动条一起移动的空间
private float moveStep = 0;//托动条的移动步调
private ViewGroup.LayoutParams layoutParams;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
screenWidth = getWindowManager().getDefaultDisplay().getWidth();
text = new TextView(this);
text.setBackgroundColor(Color.rgb(245, 245, 245));
text.setTextColor(Color.rgb(0, 161, 229));
text.setTextSize(16);
layoutParams = new ViewGroup.LayoutParams(screenWidth, 50);
textMoveLayout = (CustomLayout) findViewById(R.id.textLayout);
textMoveLayout.addView(text, layoutParams);
text.layout(0, 20, screenWidth, 80);
seekbar = (SeekBar) findViewById(R.id.seekbar);
mTvStartValue = (TextView) findViewById(R.id.start_value);
mTvEndValue = (TextView) findViewById(R.id.end_value);
seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener());
init();
}
public void init() {
mTvStartValue.setText(String.valueOf(startValue));
mTvEndValue.setText(String.valueOf(endValue));
text.setText(String.valueOf(startValue));
seekbar.setEnabled(true);
seekbar.setMax(Math.abs(endValue));
seekbar.setProgress(startValue);
if (startValue < 0 && endValue < 0) {
totalValue = Math.abs(startValue) - Math.abs(endValue);
} else if (startValue < 0 && endValue > -1) {
totalValue = endValue + Math.abs(startValue);
} else {
totalValue = endValue - startValue;
}
moveStep = (float) (((float) screenWidth / totalValue) * 0.8);
}
private class OnSeekBarChangeListener implements
SeekBar.OnSeekBarChangeListener {
// 触发操作，拖动
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
text.layout((int) (progress * moveStep), 20, screenWidth, 80);
text.setText(check(progress));
}
// 表示进度条刚开始拖动，开始拖动时候触发的操作
public void onStartTrackingTouch(SeekBar seekBar) {
}
// 停止拖动时候
public void onStopTrackingTouch(SeekBar seekBar) {
}
}
private String check(int progress) {
int curValue = totalValue * progress/Math.abs(endValue);
if (startValue <0 && endValue < 0) {
curValue = startValue + curValue;
} else if (startValue < 0 && endValue > -1) {
curValue = curValue + startValue;
}
Log.e("check", totalValue+"，"+curValue+"，"+ seekbar.getMax());
return String.valueOf(curValue);
}
}
三、po_seekbar.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@*android:id/background">
<shape>
<solid android:color="#c6c6c6" />
</shape>
</item>
<item android:id="@*android:id/secondaryProgress">
<clip>
<shape>
<solid android:color="#c6c6c6" />
</shape>
</clip>
</item>
<item android:id="@*android:id/progress">
<clip>
<shape>
<solid android:color="#06a7fa" />
</shape>
</clip>
</item>
</layer-list>
四、seekbar_thumb.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@mipmap/seekbar_nomal" android:state_focused="true" android:state_pressed="false"/>
<item android:drawable="@mipmap/seekbar_press" android:state_focused="true" android:state_pressed="true"/>
<item android:drawable="@mipmap/seekbar_press" android:state_focused="false" android:state_pressed="true"/>
<item android:drawable="@mipmap/seekbar_nomal"/>
</selector>
五、activity_main.xml
<?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:background="#F5F5F5"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<la.trytry.seekbar.CustomLayout
android:id="@+id/textLayout"
android:layout_width="match_parent"
android:layout_height="40dp" />
<SeekBar
android:id="@+id/seekbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="true"
android:maxHeight="4dp"
android:minHeight="4dp"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:progressDrawable="@drawable/po_seekbar"
android:thumb="@drawable/seekbar_thumb" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/start_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginLeft="14dp"
android:textColor="#959595" />
<TextView
android:id="@+id/end_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginRight="14dp"
android:textColor="#959595" />
</RelativeLayout>
</LinearLayout>
