Progress bar for Android Development

I. Basic Knowledge:

 

1. ProgressBar layout in the interface file XML:

[Html]

<ProgressBar android: id = "@ + id/progressbar_updown"

Android: layout_width = "200dp"

Android: layout_height = "wrap_content"

Style = "? Android: attr/progressBarStyleHorizontal"

Android: layout_gravity = "center_vertical"

Android: max = "100"

Android: progress = "50"

Android: secondaryProgress = "70">

<ProgressBar android: id = "@ + id/progressbar_updown"

Android: layout_width = "200dp"

Android: layout_height = "wrap_content"

Style = "? Android: attr/progressBarStyleHorizontal"

Android: layout_gravity = "center_vertical"

Android: max = "100"

Android: progress = "50"

Android: secondaryProgress = "70">

[Plain]

Style = "? Android: attr/progressBarStyleHorizontal "sets the style to long

Android: max = "100" maximum progress value is 100

Android: progress = "50" initialization progress Value

Android: secondaryProgress = "70" indicates the Second Progress value at the underlying layer during initialization.

Android: layout_gravity = "center_vertical" vertical center

Style = "? Android: attr/progressBarStyleHorizontal "sets the style to long

Android: max = "100" maximum progress value is 100

Android: progress = "50" initialization progress Value

Android: secondaryProgress = "70" indicates the Second Progress value at the underlying layer during initialization.

Android: layout_gravity = "center_vertical" vertical center

 

 

2. control and use of ProgressBar in the code file (. java:

[Java]

Private ProgressBar myProgressBar;

// Define ProgressBar

 

MyProgressBar = (ProgressBar) findViewById (R. id. progressbar_updown );

// ProgressBar obtains the ID from XML

 

MyProgressBar. incrementProgressBy (5 );

// Increase the progress value of ProgressBar by 5

 

MyProgressBar. incrementProgressBy (-5 );

// The Progress value of ProgressBar is reduced by 5

 

MyProgressBar. incrementSecondaryProgressBy (5 );

// The Progress value of the Second progress bar increases by 5

 

MyProgressBar. incrementSecondaryProgressBy (-5 );

// The Progress value of the Second progress bar is reduced by 5

Private ProgressBar myProgressBar;

// Define ProgressBar

MyProgressBar = (ProgressBar) findViewById (R. id. progressbar_updown );

// ProgressBar obtains the ID from XML

MyProgressBar. incrementProgressBy (5 );

// Increase the progress value of ProgressBar by 5

MyProgressBar. incrementProgressBy (-5 );

// The Progress value of ProgressBar is reduced by 5

MyProgressBar. incrementSecondaryProgressBy (5 );

// The Progress value of the Second progress bar increases by 5

MyProgressBar. incrementSecondaryProgressBy (-5 );

// The Progress value of the Second progress bar is reduced by 5

 

3. Important XML attributes

Android: progressBarStyle: Default progress bar style

Android: progressBarStyleHorizontal: horizontal style

 

 

4. Important Methods

[Plain]

GetMax (): Maximum range of the returned progress bar

 

GetProgress (): returns the progress

 

GetSecondaryProgress (): returns the secondary progress

 

IncrementProgressBy (int diff): Specifies the increase progress.

 

IsIndeterminate (): indicates whether the progress bar is in uncertain mode.

 

SetIndeterminate (boolean indeterminate): sets the uncertain mode.

 

SetVisibility (int v): sets whether the progress bar is visible.

GetMax (): Maximum range of the returned progress bar

GetProgress (): returns the progress

GetSecondaryProgress (): returns the secondary progress

IncrementProgressBy (int diff): Specifies the increase progress.

IsIndeterminate (): indicates whether the progress bar is in uncertain mode.

SetIndeterminate (boolean indeterminate): sets the uncertain mode.

SetVisibility (int v): sets whether the progress bar is visible.

 

Ii. Code display:

1. "Activity_09srcyanactivity_09MainActivity.java"

[Java]

Package yan. activity_09;

 

Import android. OS. Bundle;

Import android. view. View;

Import android. view. View. OnClickListener;

Import android. widget. Button;

Import android. widget. ProgressBar;

Import android. app. Activity;

 

Public class MainActivity extends Activity {

// Declare Variables

Private ProgressBar firstBar = null;

Private ProgressBar secondBar = null;

Private Button myButton = null;

Private int progress_vol = 0;

@ Override

Protected void onCreate (Bundle savedInstanceState ){

Super. onCreate (savedInstanceState );

SetContentView (R. layout. main );

// Map the Control ID to the variable

FirstBar = (ProgressBar) findViewById (R. id. firstBar );

SecondBar = (ProgressBar) findViewById (R. id. secondBar );

MyButton = (Button) findViewById (R. id. myButton );

MyButton. setOnClickListener (new ButtonListenr ());

}

Class ButtonListenr implements OnClickListener {

 

@ Override

Public void onClick (View v ){

// TODO Auto-generated method stub

If (0 = progress_vol)

{

// Set the maximum value of the progress bar

FirstBar. setMax (200 );

// Set the progress bar to a visible state

FirstBar. setVisibility (View. VISIBLE );

SecondBar. setVisibility (View. VISIBLE );

} Else if (progress_vol <firstBar. getMax ()){

// Set the current value of the main progress bar

FirstBar. setProgress (progress_vol );

// Set the current value of the Second progress bar

FirstBar. setSecondaryProgress (progress_vol + 10 );

// The progress bar cannot be displayed by default.

// SecondBar. setProgress (progress_vol );

} Else {

// Set the progress bar to an invisible state

FirstBar. setVisibility (View. GONE );

SecondBar. setVisibility (View. GONE );

}

Progress_vol + = 10;

}

}

}

Package yan. activity_09;

Import android. OS. Bundle;

Import android. view. View;

Import android. view. View. OnClickListener;

Import android. widget. Button;

Import android. widget. ProgressBar;

Import android. app. Activity;

Public class MainActivity extends Activity {

// Declare Variables

Private ProgressBar firstBar = null;

Private ProgressBar secondBar = null;

Private Button myButton = null;

Private int progress_vol = 0;

 

@ Override

Protected void onCreate (Bundle savedInstanceState ){

Super. onCreate (savedInstanceState );

SetContentView (R. layout. main );

// Map the Control ID to the variable

FirstBar = (ProgressBar) findViewById (R. id. firstBar );

SecondBar = (ProgressBar) findViewById (R. id. secondBar );

MyButton = (Button) findViewById (R. id. myButton );

MyButton. setOnClickListener (new ButtonListenr ());

}

 

Class ButtonListenr implements OnClickListener {

@ Override

Public void onClick (View v ){

// TODO Auto-generated method stub

If (0 = progress_vol)

{

// Set the maximum value of the progress bar

FirstBar. setMax (200 );

// Set the progress bar to a visible state

FirstBar. setVisibility (View. VISIBLE );

SecondBar. setVisibility (View. VISIBLE );

} Else if (progress_vol <firstBar. getMax ()){

// Set the current value of the main progress bar

FirstBar. setProgress (progress_vol );

// Set the current value of the Second progress bar

FirstBar. setSecondaryProgress (progress_vol + 10 );

// The progress bar cannot be displayed by default.

// SecondBar. setProgress (progress_vol );

} Else {

// Set the progress bar to an invisible state

FirstBar. setVisibility (View. GONE );

SecondBar. setVisibility (View. GONE );

}

Progress_vol + = 10;

}

}

}

 

2. "Activity_09reslayoutmain.xml"

[Html]

<? Xml version = "1.0" encoding = "UTF-8"?>

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"

Android: orientation = "vertical"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

Android: background = "#00 aaaa"

>

<TextView

Android: id = "@ + id/firstText"

Android: text = "@ string/hello_world"

Android: gravity = "center_vertical"

Android: textSize = "15pt"

Android: background = "# aa0000"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: singleLine = "true"/>

<ProgressBar

Android: id = "@ + id/firstBar"

Style = "? Android: attr/progressBarStyleHorizontal"

Android: layout_width = "200dp"

Android: layout_height = "wrap_content"

Android: visibility = "gone"

/>

<ProgressBar

Android: id = "@ + id/secondBar"

Style = "? Android: attr/progressBarStyle"

Android: layout_width = "wrap_content"

Android: layout_height = "wrap_content"

Android: visibility = "gone"

/>

<Button

Android: id = "@ + id/myButton"

Android: layout_width = "wrap_content"

Android: layout_height = "wrap_content"

Android: text = "begin"

/>

</LinearLayout>

<? Xml version = "1.0" encoding = "UTF-8"?>

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"

Android: orientation = "vertical"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

Android: background = "#00 aaaa"

>

<TextView

Android: id = "@ + id/firstText"

Android: text = "@ string/hello_world"

Android: gravity = "center_vertical"

Android: textSize = "15pt"

Android: background = "# aa0000"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: singleLine = "true"/>

<ProgressBar

Android: id = "@ + id/firstBar"

Style = "? Android: attr/progressBarStyleHorizontal"

Android: layout_width = "200dp"

Android: layout_height = "wrap_content"

Android: visibility = "gone"

/>

<ProgressBar

Android: id = "@ + id/secondBar"

Style = "? Android: attr/progressBarStyle"

Android: layout_width = "wrap_content"

Android: layout_height = "wrap_content"

Android: visibility = "gone"

/>

<Button

Android: id = "@ + id/myButton"

Android: layout_width = "wrap_content"

Android: layout_height = "wrap_content"

Android: text = "begin"

/>

</LinearLayout>

3. "Activity_09resvaluesstrings.xml"

[Html]

<? Xml version = "1.0" encoding = "UTF-8"?>

<Resources>

 

<String name = "app_name"> Activity_09 </string>

<String name = "hello_world"> Hello world! </String>

<String name = "menu_settings"> Settings </string>

 

</Resources>

<? Xml version = "1.0" encoding = "UTF-8"?>

<Resources>

<String name = "app_name"> Activity_09 </string>

<String name = "hello_world"> Hello world! </String>

<String name = "menu_settings"> Settings </string>

</Resources>

Iii. effect display: