閱讀《Android 從入門到精通》（17）——進度條

進度條（ProgressBar）

java.lang.Object;
android.view.View;
android.widget.ProgressBar;

ProgressBar 類方法

ProgressBar 示例

下面我們要學習該類中最常用的方法，主要是 setMax 和 setProgress 等方法。

1.MainActivity.java

package com.sweetlover.activity;

import com.sweetlover.progressbar.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		final ProgressBar progressHorizontal = (ProgressBar) findViewById(R.id.progress_horizontal);
        setProgress(progressHorizontal.getProgress() * 100);
        setSecondaryProgress(progressHorizontal.getSecondaryProgress() * 100);
        
        Button button = (Button) findViewById(R.id.increase);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                progressHorizontal.incrementProgressBy(1);
                // Title progress is in range 0..10000
                setProgress(100 * progressHorizontal.getProgress());
            }
        });

        button = (Button) findViewById(R.id.decrease);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                progressHorizontal.incrementProgressBy(-1);
                // Title progress is in range 0..10000
                setProgress(100 * progressHorizontal.getProgress());
            }
        });

        button = (Button) findViewById(R.id.increase_secondary);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                progressHorizontal.incrementSecondaryProgressBy(1);
                // Title progress is in range 0..10000
                setSecondaryProgress(100 * progressHorizontal.getSecondaryProgress());
            }
        });

        button = (Button) findViewById(R.id.decrease_secondary);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                progressHorizontal.incrementSecondaryProgressBy(-1);
                // Title progress is in range 0..10000
                setSecondaryProgress(100 * progressHorizontal.getSecondaryProgress());
            }
        });
	}
}

2.activity_main.xml

<!--{cke_protected}{C}%3C!%2D%2D%3Fxml%20version%3D%221.0%22%20encoding%3D%22utf-8%22%3F%2D%2D%3E-->
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="30dp">

    <progressbar android:id="@+id/progress_horizontal" style="?android:attr/progressBarStyleHorizontal" android:layout_width="200dip" android:layout_height="wrap_content" android:layout_gravity="center" android:max="100" android:progress="50" android:secondaryprogress="75">

    <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_margintop="20dp" android:text="@string/normal">


    <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:layout_margintop="20dp"><button android:id="@+id/decrease" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/decrease"></button><button android:id="@+id/increase" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/increase">

    

    <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_margintop="20dp" android:text="@string/custom">


    <linearlayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:layout_margintop="20dp">

        </linearlayout></textview></button><button android:id="@+id/decrease_secondary" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/decrease"></button><button android:id="@+id/increase_secondary" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/increase"></button></linearlayout></textview></progressbar></linearlayout>

3.strings.xml

<resources>

    <string name="app_name">ProgressBar</string>
    <string name="normal">默認進度條</string>
    <string name="decrease">減少</string>
    <string name="increase">增加</string>
    <string name="custom">自定義進度條</string>
    

</resources>

4.AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.sweetlover.progressbar" android:versioncode="1" android:versionname="1.0">

    <uses-sdk android:minsdkversion="8" android:targetsdkversion="19">

    <application android:allowbackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme">
        <activity android:name="com.sweetlover.activity.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN">
                <category android:name="android.intent.category.LAUNCHER">
            </category></action></intent-filter>
        </activity>
    </application>

</uses-sdk></manifest>