安卓天天練練（十二）進度條

標籤：

又是一個安卓內建的方便控制項，不用我html/css/js自己寫了。

用可視化面板拖進去以後

<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="com.narumi.android_13_1.MainActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <SeekBar        android:id="@+id/seekBar1"        android:layout_width="match_parent"        android:layout_height="50dp"        android:layout_alignParentLeft="true"        android:layout_below="@+id/textView1"        android:layout_marginTop="93dp" />    <ProgressBar        android:id="@+id/progressBar1"        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView1"        android:layout_below="@+id/textView1"        android:layout_marginTop="29dp"        android:maxWidth="200dp" /></RelativeLayout>

java裡面擷取一下控制項對象，綁定事件，這裡使得第一個bar跟隨後面的seekbar改進度

package com.narumi.android_13_1;import android.app.Activity;import android.os.Bundle;import android.widget.ProgressBar;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        //final才能使子方法的代碼塊訪問得到        final SeekBar skb = (SeekBar)findViewById(R.id.seekBar1);        final ProgressBar pb = (ProgressBar)findViewById(R.id.progressBar1);        skb.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {                        @Override            public void onStopTrackingTouch(SeekBar seekBar) {                // TODO Auto-generated method stub                            }                        @Override            public void onStartTrackingTouch(SeekBar seekBar) {                // TODO Auto-generated method stub                            }                        @Override            public void onProgressChanged(SeekBar seekBar, int progress,                    boolean fromUser) {                // TODO Auto-generated method stub                pb.setProgress(skb.getProgress());            }        });    }    }

這樣看來做js的比做java的要底層啊^_^

 

安卓天天練練（十二）進度條