SeekBar元件應用

1.UI的xml檔

<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"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Sound : " />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/textView1"

        android:layout_below="@+id/textView1"

        android:layout_marginTop="59dp"

        android:text="Sound Adjustment" />

</RelativeLayout>

2.主程式程式碼

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import android.widget.TextView;

public class MainActivity extends Activity {

Button button;

TextView tv;

private int resault;

SeekBar seekbar;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

button = (Button) this.findViewById(R.id.button1);

tv = (TextView) this.findViewById(R.id.textView1);

setSeekBar();

button.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View arg0) {

seekbar.setProgress(resault);

new AlertDialog.Builder(MainActivity.this, 5)

.setTitle("Sound Adjustment")

.setPositiveButton("Cancel",

new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog,

int which) {

setSeekBar();

}

})

.setView(seekbar)

.setNegativeButton("Determine",

new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface arg0,

int arg1) {

tv.setText("Sound : " + resault);

setSeekBar();

}

}).show();

}

});

}

public void setSeekBar() {

seekbar = new SeekBar(MainActivity.this);

seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

@Override

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

resault = seekbar.getProgress();

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

});

}

}