Android ProgressBar进度条使用详解

<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"
tools:context="cn.teachcourse.www.MainActivity"
android:orientation="vertical"
android:gravity="center"
android:id="@+id/onclick_ll" >
<!--点击LinearLayout控件，改变ProgressBar进度-->
<ProgressBar
android:id="@+id/progressBar_horizontal"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="15dp"
android:layout_marginTop="28dp"/>

</LinearLayout>

public class MainActivity extends ActionBarActivity implements View.OnClickListener{
private ProgressBar pb_large;
private ProgressBar pb_normal;
private ProgressBar pb_small;
private ProgressBar pb_horizontal;
private int readed;
private int progressValue;

private LinearLayout onclick_ll;

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

Drawable drawable = getResources().getDrawable(
R.drawable.progress_bar_states);

pb_horizontal.setProgressDrawable(drawable);//设置水平滚动条的样式

pb_horizontal.setMax(100);//设置进度条的最大值
onclick_ll.setOnClickListener(this);//LinearLayout添加监视器
}

private void initView() {
pb_horizontal = (ProgressBar) findViewById(R.id.progressBar_horizontal);
onclick_ll=(LinearLayout)findViewById(R.id.onclick_ll);
}

@Override
public void onClick(View v) {
pb_horizontal.incrementProgressBy(5);
if(pb_horizontal.getProgress()==pb_horizontal.getMax()){
Toast.makeText(this, "进度条已经达到最大值,进度条消失", Toast.LENGTH_LONG).show();
pb_horizontal.setProgress(0); //当达到最大之后，进度值归0
}
}
}

<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"
tools:context="cn.teachcourse.www.MainActivity"
android:orientation="vertical"
android:gravity="center" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="@+id/read_data_tv"
android:text="@string/read_info"
android:scrollbars="vertical"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:lineSpacingExtra="10dp"/>

<ProgressBar
android:id="@+id/progressBar_horizontal_read_data"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="15dp"
android:layout_marginTop="28dp"/>

</LinearLayout>

public class ProgressBarActivity extends ActionBarActivity {
private ProgressBar pb_horizontal;
private int readed;
private int progressValue;
private TextView mReadProgress_TV;
private String mData;
private StringBuffer sb;//每次读取到的字节数据存储
int length;//标记文件大小
private Thread thread;//读取文件线程
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.progress_horizontal_read_data);
initView();

Drawable drawable = getResources().getDrawable(
R.drawable.progress_bar_states);
String path = Environment.getExternalStorageDirectory()
+ "/ProgressMonitor.txt";// ProgressMonitor.txt是我存到sdcard中的一个文件，可以自定义文件名大小位置
final File file = new File(path);

if(file.exists()){
length=(int) file.length();
pb_horizontal.setMax(length);//设置进度条最大值
pb_horizontal.setProgressDrawable(drawable);//自定义进度条样式
}
//启动一个线程读取文件内容
thread=new Thread() {

@Override
public void run() {
readFromFile(file.getAbsolutePath());
}

};
thread.start();

}

Handler handler = new Handler() {

@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 110:
progressValue += msg.arg1;
pb_horizontal.setProgress(progressValue);
mReadProgress_TV.setText(sb.toString());
if(progressValue==length){
Toast.makeText(ProgressBarActivity.this, "文件读取完成", Toast.LENGTH_LONG).show();
}
Log.d("progressValue-------------->", progressValue + "");
break;

}
}

};

public void readFromFile(String path) {
FileInputStream fis;
try {
fis = new FileInputStream(path);
DataInputStream dis = new DataInputStream(fis);
sb=new StringBuffer();
byte b[] = new byte[10];// 每次读取1字节
while ((readed = dis.read(b)) != -1) {
Message msg = new Message();
msg.arg1 = readed;
msg.what = 110;
mData=new String(b,0,readed);
sb.append(mData);
handler.sendMessage(msg);
try {
Thread.sleep(1000);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

dis.close();
fis.close();
} catch (Exception e) {

e.printStackTrace();
}

}

private void initView() {
pb_horizontal = (ProgressBar) findViewById(R.id.progressBar_horizontal_read_data);
mReadProgress_TV=(TextView)findViewById(R.id.read_data_tv);
}

}