Android之SeekBar

一. 初步认识

src

package cn.android.lyj;import android.app.Activity;import android.os.Bundle;import android.widget.SeekBar;import android.widget.TextView;public class Activity_01 extends Activity implements SeekBar.OnSeekBarChangeListener { SeekBar mSeekBar; TextView mProgressText; TextView mTrackingText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mSeekBar = (SeekBar)findViewById(R.id.seek); mSeekBar.setOnSeekBarChangeListener(this); mProgressText = (TextView)findViewById(R.id.progress); mTrackingText = (TextView)findViewById(R.id.tracking); } //进度条改变事件 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) { mProgressText.setText(progress + " " + getString(R.string.seekbar_from_touch) + "=" + fromTouch); } //接触拖动条事件 public void onStartTrackingTouch(SeekBar seekBar) { mTrackingText.setText(getString(R.string.seekbar_tracking_on)); } //离开接触条事件 public void onStopTrackingTouch(SeekBar seekBar) { mTrackingText.setText(getString(R.string.seekbar_tracking_off)); }}

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <SeekBar android:id="@+id/seek" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="100" android:progress="50" android:secondaryProgress="75" /> <TextView android:id="@+id/progress" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/tracking" android:layout_width="match_parent" android:layout_height="wrap_content" /></LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?><resources> <string name="seekbar_tracking_on">Tracking on</string> <string name="seekbar_tracking_off">Tracking off</string> <string name="seekbar_from_touch">from touch</string> <string name="app_name">SeekBar</string></resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.android.lyj" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:label="@string/app_name" android:name=".Activity_01" > <intent-filter > <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application></manifest>

二. 运行结果

启动时在50

拖动到25

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