Android程序:进度条（ProgressBar）的使用方法和案例

public class MainActivity extends Activity implements OnClickListener {

private ProgressBar progressBar;
private Button btAdd;
private Button btReduce;
private Button btReSet;
private TextView text;
private ProgressDialog progressDialog;
private Button btShow;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

progressBar = (ProgressBar) findViewById(R.id.progressBar);
btAdd = (Button) findViewById(R.id.add);
btReduce = (Button) findViewById(R.id.reduce);
btReSet = (Button) findViewById(R.id.reset);
text = (TextView) findViewById(R.id.text);
btShow = (Button) findViewById(R.id.show);

// 获取第一条进度条的进度
int first = progressBar.getProgress();
// 获取第二条进度条的进度
int second = progressBar.getSecondaryProgress();
// 获取进度条的最大进度
int max = progressBar.getMax();

text.setText("第一进度百分比：" + (int) (first * 100.0 / max) + "%,第二进度百分比："
+ (int) (second * 100.0 / max) + "%");

btAdd.setOnClickListener(this);
btReduce.setOnClickListener(this);
btReSet.setOnClickListener(this);
btShow.setOnClickListener(this);

}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.add:
// 两个进度都增加10个刻度
progressBar.incrementProgressBy(10);
progressBar.incrementSecondaryProgressBy(10);

break;
case R.id.reduce:
progressBar.incrementProgressBy(-10);
progressBar.incrementSecondaryProgressBy(-10);

break;
case R.id.reset:
progressBar.setProgress(50);
progressBar.setSecondaryProgress(80);

break;
case R.id.show:
//新建ProgressDialog对象
progressDialog=new ProgressDialog(this);
//设置显示风格
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
//设置标题
progressDialog.setTitle("对话框进度条");
//设置对话框中的文字
progressDialog.setMessage("这是对话框进度条");
//设置图标
progressDialog.setIcon(R.drawable.ic_launcher);

/**
* 设定关于ProgressBar的一些属性
*/
//设定最大进度
progressDialog.setMax(100);
//设定初始化的进度
progressDialog.incrementProgressBy(50);
//进度条是明确显示进度的
progressDialog.setIndeterminate(false);

/**
* 设定一个确定按钮
*/
progressDialog.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "点了确定", Toast.LENGTH_SHORT).show();
}
});

//是否可以通过返回按钮退出对话框
progressDialog.setCancelable(true);

//显示ProgressDialog
progressDialog.show();

break;

}
text.setText("第一进度百分比："
+ (int) (progressBar.getProgress() * 100.0 / progressBar
.getMax())
+ "%,第二进度百分比："
+ (int) (progressBar.getSecondaryProgress() * 100.0 / progressBar
.getMax()) + "%");
}

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<!--
android:progressDrawable="" 可以定义配色方案
-->

<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="100"
android:progress="50"
android:secondaryProgress="80" />

<Button
android:id="@+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/add" />

<Button
android:id="@+id/reduce"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/reduce" />

<Button
android:id="@+id/reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/reset" />

<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

<Button
android:id="@+id/show"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/show" />

</LinearLayout>