代码里面;
package com.example.seek; import android.os.Bundle; import android.app.Activity; import android.content.Context; import android.util.DisplayMetrics; import android.view.Menu; import android.widget.RelativeLayout.LayoutParams; import android.widget.SeekBar; import android.widget.TextView; import android.widget.SeekBar.OnSeekBarChangeListener; public class MainActivity extends Activity { private TextView textView; private SeekBar seekBar; private double width, fDensity; private int numbers = 0; private DisplayMetrics displaysMetrics; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); seekBar=(SeekBar) findViewById(R.id.seekBar1); textView=(TextView) findViewById(R.id.textView1); initView(); } // 获取屏幕信息,以及初始化操作 private void initView() { displaysMetrics = getResources().getDisplayMetrics(); width = displaysMetrics.widthPixels; fDensity = (width - dip2px(this, 51)) / 100; seekBar = (SeekBar) findViewById(R.id.seekBar1); textView = (TextView) findViewById(R.id.textView1); initSeekBarProgress(); } // TextView跟随SeekBar移动 private void initSeekBarProgress() { seekBar.setProgress(numbers); seekBar.setOnSeekBarChangeListener(mSeekChange); LayoutParams paramsStrength = new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); paramsStrength.leftMargin = (int) (numbers * fDensity); textView.setLayoutParams(paramsStrength); textView.setText(numbers + "元"); } private OnSeekBarChangeListener mSeekChange = new OnSeekBarChangeListener() { public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { numbers = progress; LayoutParams paramsStrength = new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); paramsStrength.leftMargin = (int) (progress * fDensity); textView.setLayoutParams(paramsStrength); textView.setText(numbers + "元"); } public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } }; /** * 根据手机分辨率从 px(像素) 单位 转成 dp */ public static int px2dip(Context context, float pxValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue / scale + 0.5f); } /** * 根据手机分辨率从 dp 单位 转成 px(像素) */ public static int dip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } }
xml里面;
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginTop="83dp" android:text="TextView" /> <SeekBar android:id="@+id/seekBar1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/textView1" /> </RelativeLayout>
时间: 2024-11-03 22:42:57