【移动应用开发技术】Android（4.X）学习笔记

【移动应用开发技术】Android（4.X）学习笔记

Activity启动流程Android操作系统>AndroidManifest.xml>MainAcitivity.onCreate()>activity_main.xml...sp字体大小会随系统设置的改变而变dp字体大小不会随系统设置的改变而变Ctrl+shift+O自动导入Fragment的知识特别重要<LinearLayout

xmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#440000"

android:orientation="horizontal"

tools:context=".MainActivity"

>

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical"

android:layout_marginRight="20dp"

android:background="#ff0000"

>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="20sp"

android:text="first"/>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="20sp"

android:text="second"/>

</LinearLayout>

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical"

android:background="#ff0000"

>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="20sp"

android:text="first"/>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="20sp"

android:text="second"/>

</LinearLayout>

</LinearLayout><LinearLayout

xmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="vertical"

tools:context=".MainActivity"

>

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="#ff0000"

>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="#00ff00"

android:text="first"

/>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="#0000ff"

android:text="second"

/>

</LinearLayout>

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="#ff0000"

>

<TextView

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_weight="1"

android:background="#00ff00"

android:text="first"

/>

<TextView

android:layout_width="0dp"

android:layout_height="wrap_content"

android:background="#0000ff"

android:layout_weight="2"

android:text="second"

/>

</LinearLayout>

</LinearLayout><RelativeLayout

xmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:padding="15dp"

>

<TextView

android:id="@+id/lableView"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:text="登陆界面"

/>

<EditText

android:id="@+id/usernameText"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentRight="true"

android:hint="username"

android:layout_below="@id/lableView"/>

<EditText

android:id="@+id/passwordText"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@id/usernameText"

android:layout_alignRight="@id/usernameText"

android:hint="password"

android:inputType="textPassword"

android:layout_below="@id/usernameText"/>

<Button

android:id="@+id/cancelButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@id/passwordText"

android:layout_alignParentRight="true"

android:text="取消"

/>

<Button

android:id="@+id/okButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBottom="@id/cancelButton"

android:layout_toLeftOf="@id/cancelButton"

android:text="确定"/>

</RelativeLayout>

<AnalogClock

android:id="@+id/clock"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

<DatePicker

android:id="@+id/firstDatePicker"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

/>

<Button

android:id="@+id/button"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/firstDatePicker"

android:text="获取DatePicker的值"/>public

class

MainActivity

extends

Activity

{

private

DatePicker

datePicker;

private

Button

button;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

datePicker

=

(DatePicker)findViewById(R.id.firstDatePicker);

datePicker.updateDate(2013,

4,

10);

button

=

(Button)findViewById(R.id.button);

ButtonListener

buttonListener

=

new

ButtonListener();

button.setOnClickListener(buttonListener);

}

class

ButtonListener

implements

OnClickListener{

@Override

public

void

onClick(View

v)

{

int

y

=

datePicker.getYear();

int

m

=

datePicker.getMonth();

int

d

=

datePicker.getDayOfMonth();

System.out.println("y:"

+

y

+

",m"

+

m

+

",d:"

+

d);

Toast.makeText(MainActivity.this,

"y:"

+

y

+

",m"

+

m

+

",d:"

+

d,

Toast.LENGTH_SHORT).show();

}

}

}

<TimePicker

android:id="@+id/firstTimePicker"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

/>

<Button

android:id="@+id/button"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/firstTimePicker"

android:text="获取TimePicker的值"

/>public

class

MainActivity

extends

Activity

{

private

TimePicker

firstTimePicker;

private

Button

button;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

firstTimePicker

=

(TimePicker)findViewById(R.id.firstTimePicker);

button

=

(Button)findViewById(R.id.button);

//该函数用于设置是否使用24小时制显示时间

firstTimePicker.setIs24HourView(true);

TimeListener

timeListenter

=

new

TimeListener();

firstTimePicker.setOnTimeChangedListener(timeListenter);

ButtonListener

buttonListener

=

new

ButtonListener();

button.setOnClickListener(buttonListener);

}

class

ButtonListener

implements

OnClickListener{

@Override

public

void

onClick(View

v)

{

int

hour

=

firstTimePicker.getCurrentHour();

int

minute

=

firstTimePicker.getCurrentMinute();

Toast.makeText(MainActivity.this,

"h:"

+

hour

+

",minute:"

+

minute,

Toast.LENGTH_SHORT).show();

}

}

class

TimeListener

implements

OnTimeChangedListener{

/**

*

view:该对象代表着TimePicker

*

hourOfDay:用户所选择的小时

*

minute:用户所选择的分钟

*/

@Override

public

void

onTimeChanged(TimePicker

view,

int

hourOfDay,

int

minute)

{

System.out.println("Hour:"

+

hourOfDay

+

",minute:"

+

minute);

}

}

}

<ProgressBar

android:id="@+id/firstProgressBar"

android:layout_width="match_parent"

android:layout_height="wrap_content"

/>

<Button

android:id="@+id/firstButton"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/firstProgressBar"

android:text="增加第一进度"/>

<Button

android:id="@+id/secondButton"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/firstButton"

android:text="增加第二进度"/>public

class

MainActivity

extends

Activity

{

private

ProgressBar

progressBar;

private

Button

firstButton;

private

Button

secondButton;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

progressBar

=

(ProgressBar)findViewById(R.id.firstProgressBar);

firstButton

=

(Button)findViewById(R.id.firstButton);

secondButton

=

(Button)findViewById(R.id.secondButton);

progressBar.setMax(100);

firstButton.setOnClickListener(new

FirstListener());

secondButton.setOnClickListener(new

SecondListener());

}

class

FirstListener

implements

OnClickListener{

@Override

public

void

onClick(View

v)

{

progressBar.incrementProgressBy(10);

}

}

class

SecondListener

implements

OnClickListener{

@Override

public

void

onClick(View

v)

{

progressBar.incrementSecondaryProgressBy(20);

}

}

}

<SeekBar

android:id="@+id/firstSeekBar"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:max="100"

/>public

class

MainActivity

extends

Activity

{

private

SeekBar

seekBar;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

seekBar

=

(SeekBar)findViewById(R.id.firstSeekBar);

seekBar.setProgress(30);

seekBar.setSecondaryProgress(50);

SeekBarListener

listener

=

new

SeekBarListener();

seekBar.setOnSeekBarChangeListener(listener);

}

class

SeekBarListener

implements

OnSeekBarChangeListener{

/**

*

seekBar

该对象指的是触发了监听器的SeekBar对象

*

progress

指的是当前SeekBar的进度

*

fromUser

*/

@Override

public

void

onProgressChanged(SeekBar

SeekBar,

int

progress,

boolean

fromUser)

{

System.out.println("progress:"

+

progress

+

",fromUser:"

+

fromUser);

Toast.makeText(MainActivity.this,

"progress:"

+

progress

+

",fromUser:"

+

fromUser,

Toast.LENGTH_SHORT).show();

}

@Override

public

void

onStartTrackingTouch(SeekBar

seekBar)

{

System.out.println("onStart");

}

@Override

public

void

onStopTrackingTouch(SeekBar

seekBar)

{

System.out.println("onStop");

}

}

}

<RatingBar

android:id="@+id/firstRatingBar"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:numStars="4"

android:stepSize="1"

/>

<Button

android:id="@+id/button"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@id/firstRatingBar"

android:text="button"/>public

class

MainActivity

extends

Activity

{

private

RatingBar