ProgressBar提供了可以向用户展示当前任务的进度。
完成效果如下，单击增加/减少进度可以调节进度。
完成步骤一：layout的xml文件中activity_main.xml完成代码
<LinearLayout 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:orientation="vertical"
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:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="小圆形进度条" />
<ProgressBar
style="?android:attr/progressBarStyleSmallTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ProgressBar>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="中圆形进度条" >
</TextView>
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="大圆形进度条" >
</TextView>
<ProgressBar
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ProgressBar>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="水平进度条" >
</TextView>
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="100"
android:progress="30" >
</ProgressBar>
<ProgressBar
android:id="@+id/progressbar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:max="100"
android:progress="30"
android:secondaryProgress="60" >
</ProgressBar>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="增加进度" >
</Button>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="减小进度" >
</Button>
</LinearLayout>
</LinearLayout>
完成步骤二：mainactivity.java中完成代码：
package com.example.android_programbar;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.ProgressBar;
import android.view.View.OnClickListener;
public class MainActivity extends Activity implements OnClickListener{
private ProgressBar progressBar;
private Button button1, button2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
//设置窗口有刻度
requestWindowFeature(Window.FEATURE_PROGRESS);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.activity_main);
progressBar = (ProgressBar) this.findViewById(R.id.progressbar);
setProgressBarVisibility(true);
setProgressBarIndeterminate(true);
setProgress(3500);
button1 = (Button) this.findViewById(R.id.button1);
button2 = (Button) this.findViewById(R.id.button2);
button1.setOnClickListener( this);
button2.setOnClickListener( this);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
progressBar.setProgress((int) (progressBar.getProgress() * 1.2));
progressBar.setSecondaryProgress((int) (progressBar
.getSecondaryProgress() * 1.2));
break;
case R.id.button2:
progressBar.setProgress((int) (progressBar.getProgress() * 0.6));
progressBar.setSecondaryProgress((int) (progressBar
.getSecondaryProgress() * 0.6));
break;
}
}
}
