SeekBar跟TextView跟着拖动

来源：互联网发布：mac版魔兽世界大脚插件编辑：程序博客网时间：2024/06/07 13:28

不罗嗦，直接写代码

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content">    <TextView        android:layout_marginTop="50dp"        android:id="@+id/seek_progress"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginBottom="2dp"        android:layout_marginLeft="14.5dp"        android:background="@drawable/seek_progress"        android:gravity="center"        android:paddingLeft="10dp"        android:paddingRight="10dp"        android:textColor="@android:color/white"/>    <SeekBar        android:layout_below="@id/seek_progress"        android:id="@+id/seek_bar"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="25dp"        android:layout_marginRight="25dp"        android:maxHeight="6dp"        android:progressDrawable="@drawable/seekbar_drawable"        android:text="Hello World!"        android:thumb="@drawable/icon_seek" />    <Button        android:id="@+id/btn_show"        android:text="显示进度"        android:layout_below="@id/seek_bar"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></RelativeLayout>

下面开始代码部分

主要就是监听seekbar的滑动监听，<pre name="code" class="java">onStartTrackingTouch是手指按下seekbar区域时候触发，onStop是离开时候，顾名思义 <pre name="code" class="java">onProgressChanged就是 滑动的时候监听，主要逻辑也在这个里面

seekbar.setMax(100);//设置最大值        seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {            @Override            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {                    //滑动时候监听  这里面可以写想要的值                java.text.DecimalFormat df = new java.text.DecimalFormat("0.0");                float f = progress * 0.01f;                double valueWidth = tv.getWidth();                double seekWidth = seekBar.getWidth();                int marginLeft = DensityUtils.dp2px(MainActivity.this, 15.5f);                int num = (int) (seekWidth * (double) progress / (double) 99);                num -= 0.5 * (int) (valueWidth * (double) progress / (double) 99);                RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) tv                        .getLayoutParams();                params.leftMargin = num + marginLeft;                tv.setText(df.format(f));            }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {            }            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                //松开bar的时候调用                btn_show.setText(getValue());            }        });        tv.setText("0.01");

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