Android ProgressBar实现加载进度条

progressBar Android进度条组件。 progressBar的关键属性：     android:max=”100″     最大显示进度条     android:progress=”500″     第一显示进度     android:secondaryProgress=”80″     第二显示进度     android:indeterminate=”true”     设置是否精确显示  progressBar的关键方法：     setProgress(int)     设置第一进度。     setSecondaryProgress(int)     设置第二进度     getProgress()     获取第一进度     getSecondaryProgress()     获取第二进度      incrementProgressBy(int)     增加或减少第一进度     incrementSecondaryProgressBy(int)      增加或减少第二进度     getMax()    获取最大进度。  progressBar显示风格：               不设置style为中环形进度条        style=“?android:attr/progressBarStyleLarge”     //大环形进度条        style= “?android:attr/progressBarStyleSmall”     //小环形进度条        style= “?android:attr/progressBarStyleHorizontal”     //水平进度条 progressBar分类          精确显示进度和不可精确显示进度。 标题栏上的progressBar@Override        protected void onCreate(Bundle savedInstanceState) {               super.onCreate(savedInstanceState);              setContentView(R.layout. activity_main);               //启动窗口特征              requestWindowFeature(Window. FEATURE_PROGRESS);              requestWindowFeature(Window. FEATURE_INDETERMINATE_PROGRESS);               //显示两种进度条。              setProgressBarVisibility( true);              setProgressBarIndeterminateVisibility( true);              setProgress(600);     //设置带进度的进度条的刻度  最大进度值为常量10000       } 对话框形式的进度条@Override        protected void onCreate(Bundle savedInstanceState) {               super.onCreate(savedInstanceState);              setContentView(R.layout. activity_main);               //新建progressDialog对象               progressDialog=new ProgressDialog(MainActivity.this);               //设置显示风格               progressDialog.setProgressStyle(progressDialog .STYLE_HORIZONTAL);               //设置标题               progressDialog.setTitle(“” );               /*               * 设定关于捧欧冠热身赛Bar的一些属性               */               //设定最大进度               progressDialog.setMax(100);               //设定初始化已经增长的进度               progressDialog.incrementProgressBy(50);               //指定进度条是明确显示进度的               progressDialog.setIndeterminate(false);               //设定一个按钮               progressDialog.setButton(DialogInterface.BUTTON_POSITIVE,”确定 “, new DialogInterface.OnClickListener() {                                           @Override                      public void onClick(DialogInterface dialog, int which) {                           Toast. makeText(MainActivity.this, “”, Toast.LENGTH_LONG).show();                     }              });                             //是否可以通过返回按钮退出对话框               progressDialog.setCancelable(true);               //显示progreDialog               progressDialog.show();                     }