android 知识点积累一(国外英文资料).doc

android 知识点积累一(国外英文资料) Android control ProgressBar: There is no set of style progress bars, and the circle has been rotated ProgressBar Android:layout_width= wrap_content Android:layout_height= wrap_content Android:layout_gravity= center_vertical Oversized round: Style= android:attr/progressBarStyleLarge? ProgressBar Android:layout_width= wrap_content Android:layout_height= wrap_content Style=? Android:attr/progressBarStyleLarge Small round: Style= android:attr/progressBarStyleSmall? ProgressBar Android:layout_width= wrap_content Android:layout_height= wrap_content Style=? Android:attr/progressBarStyleSmall The setting style is long Style= android:attr/progressBarStyleHorizontal? ProgressBar Android:id= @+id/progressbar Style= android:attr/progressBarStyleHorizontal? Android:layout_width= fill_parent Android:layout_height= wrap_content Android:layout_margin= 20dp Android:max= 100 Android:progress= 50 Android:secondaryProgress= 75 / Explain: Style= android:attr/progressBarStyleHorizontal? The setting style is long Android:max= 100 The maximum progress value is 100 Android:progress= 50 Initialization progress value Android:secondaryProgress= 70 Initializes the bottom second progress values Android:layout_gravity= center_vertical Vertical centering Code using private, ProgressBar, myProgressBar; The definition of ProgressBar / / MyProgressBar = (ProgressBar) findViewById (R.id.progressbar_updown); //ProgressBar is obtained from XML through ID MyProgressBar.incrementProgressBy (5); //ProgressBar progress value increased by 5 MyProgressBar.incrementProgressBy (-5); //ProgressBar progress value decreased by 5 MyProgressBar.incrementSecondaryProgressBy (5); The progress value of the second progress bars behind //ProgressBar is increased by 5 MyProgressBar.incrementSecondaryProgressBy (-5); The progress value of the second progress bars behind //ProgressBar is reduced by 5 The long progress bar in the title of the page Code implementation: First, set the window style feat