Android自定义SeekBar
2016-05-17 14:44
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源码:http://download.csdn.net/detail/lm_zp/9522546
XML
XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffffff" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:orientation="vertical" > <TextView android:id="@+id/num_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/publish_seekbar_dialog" android:gravity="center_horizontal" android:paddingTop="1dp" android:text="0" android:textColor="#ffffff" /> <SeekBar android:id="@+id/seekBar1" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="100" android:progress="0" android:progressDrawable="@drawable/seekbar_img" android:thumb="@drawable/thumb" /> </LinearLayout> </RelativeLayout>MainActivity.java
package com.example.myseekbar; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.util.DisplayMetrics; import android.widget.LinearLayout; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.widget.TextView; public class MainActivity extends Activity { private TextView num_tv; 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); initView(); initSeekBarProgress(); } //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); num_tv = (TextView) findViewById(R.id.num_tv); } //TextView跟随SeekBar移动 private void initSeekBarProgress() { seekBar.setProgress(numbers); seekBar.setOnSeekBarChangeListener(mSeekChange); LinearLayout.LayoutParams paramsStrength = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); paramsStrength.leftMargin = (int) (numbers * fDensity); num_tv.setLayoutParams(paramsStrength); num_tv.setText(numbers+""); } private OnSeekBarChangeListener mSeekChange = new OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { numbers = progress; LinearLayout.LayoutParams paramsStrength = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); paramsStrength.leftMargin = (int) (progress * fDensity); num_tv.setLayoutParams(paramsStrength); num_tv.setText(numbers+""); } @Override public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override 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); } }
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