EventDemoandStyleDemoandThemeDemo
Event Handling 示例：
分为EventListener、
EventListenerRegistration和EventHandler。
注册Event的三种方法：
1) 在Activity类中使用匿名内部类（anonymous inner class）:可以用于对单个控件的处理，也可以用于对多个控件的处理，当处理多个控件需要复制代码，能够传递参数。 new OnClickListener(){
public void onClick(View v){}
}
2) 在Activity类中实现Listener接口：可以用于对单个控件的处理，也可以用于对多个控件的处理，当处理多个控件时，需要判断产生event的具体是哪个控件，从而做出不同的响应，不能传递参数。implements OnClickListener
3) 使用layout文件activity_main.xml直接实现：处理函数的返回类型必须是void，参数是View，函数名任取，不能传递参数，只能处理click事件。android：onClick
1) 在Activity类中使用匿名内部类
package com.example.shad_fnst.eventdemo; import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView; public class MainActivity extends ActionBarActivity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); Button buttonSmall = (Button) findViewById(R.id.btnSmall);
Button buttonLarge = (Button) findViewById(R.id.btnLarge); buttonSmall.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TextView textView = (TextView) findViewById(R.id.txtview);
textView.setTextSize(24);
textView.setAllCaps(true);
}
}); buttonLarge.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TextView textView = (TextView) findViewById(R.id.txtview);
textView.setTextSize(40);
textView.setTextColor(0xff32cebb);
}
});
} @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
} @Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId(); //noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
} return super.onOptionsItemSelected(item);
}
}
MainActivity.java
2) 在Activity类中实现Listener接口
package com.example.shad_fnst.eventdemo; import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView; public class MainActivity extends ActionBarActivity implements View.OnClickListener{ @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); Button buttonSmall = (Button) findViewById(R.id.btnSmall);
Button buttonLarge = (Button) findViewById(R.id.btnLarge); buttonSmall.setOnClickListener(this);
buttonLarge.setOnClickListener(this);
} @Override
public void onClick(View v) {
if(v == findViewById(R.id.btnSmall)){
TextView textView = (TextView) findViewById(R.id.txtview);
textView.setTextSize(24);
textView.setAllCaps(true);
return;
}
if(v.getId() == R.id.btnLarge){
TextView textView = (TextView) findViewById(R.id.txtview);
textView.setTextSize(40);
textView.setTextColor(0xff32cebb);
return;
}
} @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
} @Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId(); //noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
} return super.onOptionsItemSelected(item);
}
}
MainActivity.java
方法1和方法2的xml文件
<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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:orientation="vertical"> <Button
android:id="@+id/btnSmall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/button_small"/>
<Button
android:id="@+id/btnLarge"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/button_large"/> <TextView
android:id="@+id/txtview"
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:capitalize="characters"/> </LinearLayout>
main_activity.xml
3) 使用layout文件activity_main.xml直接实现
package com.example.shad_fnst.eventdemo; import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView; public class MainActivity extends ActionBarActivity{ @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
} public void doSmall(View view){
TextView textView = (TextView) findViewById(R.id.txtview);
textView.setTextSize(24);
textView.setAllCaps(true);
} public void doLarge(View view){
TextView textView = (TextView) findViewById(R.id.txtview);
textView.setTextSize(40);
textView.setTextColor(0xff32cebb);
} @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
} @Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId(); //noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
} return super.onOptionsItemSelected(item);
}
}
MainActivity.java
<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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:orientation="vertical"> <Button
android:id="@+id/btnSmall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/button_small"
android:onClick="doSmall"/>
<Button
android:id="@+id/btnLarge"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/button_large"
android:onClick="doLarge"/> <TextView
android:id="@+id/txtview"
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:capitalize="characters"/> </LinearLayout>
activity_main.xml
Style示例：
其他文件同上，修改styles.xml和activity_main.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>
<style name="CustomButtonStyle">
<item name="android:layout_width">100dp</item>
<item name="android:layout_height">38dp</item>
<item name="android:capitalize">characters</item>
<item name="android:typeface">monospace</item>
<item name="android:shadowDx">1.2</item>
<item name="android:shadowDy">1.2</item>
<item name="android:shadowRadius">2</item>
<item name="android:textColor">#494948</item>
<item name="android:gravity">center</item>
<item name="android:layout_margin">3dp</item>
<item name="android:textSize">5pt</item>
<item name="android:shadowColor">#000000</item>
</style>
<style name="CustomButtonStyle.BigButton">
<item name="android:layout_width">200dp</item>
<item name="android:layout_height">76dp</item>
<item name="android:textSize">10pt</item>
</style>
</resources>
Styles.xml
<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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:orientation="vertical"> <Button
android:id="@+id/btnSmall"
style="@style/CustomButtonStyle"
android:text="@string/button_small"
android:onClick="doSmall"/>
<Button
android:id="@+id/btnLarge"
style="@style/CustomButtonStyle.BigButton"
android:text="@string/button_large"
android:onClick="doLarge"/> <TextView
android:id="@+id/txtview"
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:capitalize="characters"/> </LinearLayout>
activity_main.xml
Theme示例：
其他文件同上，修改styles.xml,在文件AndroidManifest.xml里配置Theme，可以在application标签，也可以在activity标签。
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="android:capitalize">characters</item>
<item name="android:typeface">monospace</item>
<item name="android:shadowDx">1.2</item>
<item name="android:shadowDy">1.2</item>
<item name="android:shadowRadius">2</item>
<item name="android:textColor">#494948</item>
<item name="android:gravity">center</item>
<item name="android:layout_margin">3dp</item>
<item name="android:textSize">5pt</item>
<item name="android:shadowColor">#000000</item>
</style>
<style name="CustomButtonStyle">
<item name="android:layout_width">100dp</item>
<item name="android:layout_height">38dp</item>
</style>
<style name="CustomButtonStyle.BigButton">
<item name="android:layout_width">200dp</item>
<item name="android:layout_height">76dp</item>
<item name="android:textSize">10pt</item>
</style>
</resources>
Styles.xml
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