第一章:初入Android大门(Style 样式和Button事件)-优快云博客

给TextView加上颜色在main.xml文件里加上style="@style/DavidStyleText1"


<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    >
<TextView  
    android:id="@+id/text" 
    android:layout_width="fill_parent" 
    [b]style="@style/DavidStyleText2"[/b]
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    android:layout_x="39px"
	android:layout_y="118px"
    />
   <TextView  
    android:id="@+id/text1" 
    [b]style="@style/DavidStyleText1"[/b]
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    android:layout_x="39px"
	android:layout_y="218px"
    />
</AbsoluteLayout>

style="@style/DavidStyleText1"可以理解为在R.java里添加了一个Style对象为这个对象添加一个DavidStyleText1属性

看看R.java是不是有变化


package com.a.b.c;

public final class R {
    public static final class attr {
    }
    public static final class drawable {
        public static final int icon=0x7f020000;
    }
    public static final class id {
        public static final int myButton=0x7f060002;
        public static final int myButton1=0x7f060003;
        public static final int text=0x7f060000;
        public static final int text1=0x7f060001;
    }
    public static final class layout {
        public static final int main=0x7f030000;
    }
    public static final class string {
        public static final int app_name=0x7f040001;
        public static final int hello=0x7f040000;
    }
   [b] public static final class style {
        public static final int DavidStyleText1=0x7f050000;
        public static final int DavidStyleText2=0x7f050001;
    }[/b]
}

然后在res/values/里新建个XML文件Style.xml


<?xml version="1.0" encoding="UTF-8"?>
<resources>
	<style name="DavidStyleText1">
		<item name="android:textSize">18sp</item>
		<item name="android:textColor">#EC9237</item>
	</style>
	<style name="DavidStyleText2">
		<item name="android:textSize">14sp</item>
		<item name="android:textColor">#FF7F7C</item>
		<item name="android:fromAlpha">0.0</item>
		<item name="android:toAlpha">0.0</item>
	</style>
</resources>

<item name="android:textSize">顾名思义设置字体大小<item name="android:textColor字体颜色


package com.a.b.c;
import android.app.Activity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.widget.TextView;

public class Helloworld extends Activity {
    /** Called when the activity is first created. */
	private TextView text;
	private TextView text1;

	private DisplayMetrics dm;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        [b]text1=(TextView) findViewById(R.id.text1);
//获取手机高度和宽度,必须引入android.util.DisplayMetrics;
        dm=new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        text1.setText("come in "+dm.widthPixels+"heigth:"+dm.heightPixels);
[/b]
    }
}

RUN US......

[img]http://dl.iteye.com/upload/attachment/378203/7d77e29d-0df3-3cf4-b9bf-7da48fc15d85.jpg[/img]

按钮事件:

首先在main.xml文件里定义两个按钮：



<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    >
<TextView  
	android:id="@+id/text" 
    android:layout_width="fill_parent" 
    style="@style/DavidStyleText2"
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    android:layout_x="39px"
	android:layout_y="118px"
    />
   <TextView  
	android:id="@+id/text1" 
	style="@style/DavidStyleText1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    android:layout_x="39px"
	android:layout_y="218px"
    />
<Button
android:id="@+id/myButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="按钮"
android:layout_x="144px"
android:layout_y="289px"
>
</Button>
<Button
android:id="@+id/myButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="按钮"
android:layout_x="244px"
android:layout_y="289px"
>
</Button>
</AbsoluteLayout>

android:text="按钮" 设置按钮字，在来看看R.java


/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */

package com.a.b.c;

public final class R {
    public static final class attr {
    }
    public static final class drawable {
        public static final int icon=0x7f020000;
    }
[b]    public static final class id {
        public static final int myButton=0x7f060002;
        public static final int myButton1=0x7f060003;
        public static final int text=0x7f060000;
        public static final int text1=0x7f060001;
    }[/b]
    public static final class layout {
        public static final int main=0x7f030000;
    }
    public static final class string {
        public static final int app_name=0x7f040001;
        public static final int hello=0x7f040000;
    }
    public static final class style {
        public static final int DavidStyleText1=0x7f050000;
        public static final int DavidStyleText2=0x7f050001;
    }
}

R.java已经有了两个按钮了

Helloworld.java


package com.a.b.c;

import android.app.Activity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Helloworld extends Activity {
    /** Called when the activity is first created. */
	private TextView text;
	private TextView text1;
	private Button bt;
	private Button bt1;
	private DisplayMetrics dm;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        text=(TextView) findViewById(R.id.text);
        text1=(TextView) findViewById(R.id.text1);
        dm=new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        text1.setText("come in "+dm.widthPixels+"heigth:"+dm.heightPixels);
        /** 找到Button组件赋值给bt和bt2*/
        bt=(Button)findViewById(R.id.myButton);
        bt1=(Button)findViewById(R.id.myButton1);
        /** 给Buttont添加监听器*/
        bt.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v ){
            	text.setText("手机高度为"+dm.heightPixels);
            	text1.setText("手机宽度为"+dm.widthPixels);
            }
        });
        bt1.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v ){
            	text.setText("Hello");
            	text1.setText("World!");
            }
        });
    }
}

RUN RS.....

[img]http://dl.iteye.com/upload/attachment/378203/7d77e29d-0df3-3cf4-b9bf-7da48fc15d85.jpg[/img]

点击bt

[img]http://dl.iteye.com/upload/attachment/378214/726d8a3d-9c97-3f15-8dd3-6b9c2e4b57c2.jpg[/img]

点击bt1

[img]http://dl.iteye.com/upload/attachment/378217/339e04e8-2fc5-3053-9214-c12659187783.jpg[/img]