一.Activity全透明

 1.在res/values下建立一個colors.xml檔案,寫入透明色

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <!-- 透明 -->
    <color name="transparent"> #9000 </color>    

    <color name="wheat">#f5deb3</color>
    <color name="red">#ff0000</color>
    <color name="silver">#c0c0c0</color>

</resources>
 

2.在res/values/styles.xml下 加入樣式

<style name="transparent">
        <item name="android:windowBackground">@color/transparent</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowAnimationStyle">@+android:style/Animation.Translucent</item>
    </style>
 

3.把這個styles.xml用在相應的Activity上。即在AndroidManifest.xml中的任 意<activity>標籤中新增

android:theme="@style/AppTheme" 

如果想設定所有的activity都使用這個風格，可以把這句標籤語句新增在<application>中。

最後執行程式，哈哈，是不是發現整個介面都被蒙上一層半透明瞭。最後可以把背景色#9000換成#0000，執行程式後，就全透明瞭，看得見背景下 的所有東西可以卻都操作無效

效果圖:

二.dialog透明

1.將這個圖片,另存為 bg.9.png格式的圖片.

2.在res/values/styles.xml中寫入樣式

<style name="Tantransparent" parent="@android:style/Theme.Dialog">
         <!-- 更換背景圖片實現全透明 -->
         <item name="android:windowBackground">@drawable/bg</item>
         <!-- 螢幕背景不變暗 -->
         <item name="android:backgroundDimEnabled">false</item>
    </style>
    
     <style name="TitleText" parent="@android:style/TextAppearance.DialogWindowTitle">
         <!-- 設定Dialog標題欄文字顏色。 -->
         <item name="android:textColor">#000</item>
     </style>

3.res/layout/activity_main.xml

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#0000" >


    <Button
        android:id="@+id/btnShow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="show" >
    </Button>

</LinearLayout>

4.main_dialog.xml

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#0000" >

    <ScrollView
        android:id="@+id/ScrollView01"
        android:layout_width="wrap_content"
        android:layout_height="200.0dip"
        android:background="#0000" >

        <TextView
            android:id="@+id/TextView01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/red" >
        </TextView>
    </ScrollView>

    <Button
        android:id="@+id/btnCancel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/ScrollView01"
        android:layout_centerHorizontal="true"
        android:text="Cancel" >
    </Button>

</RelativeLayout>

5.MainActivity

package com.cn.nj.transdialog;

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

public class MainActivity extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Button btnShow = (Button) findViewById(R.id.btnShow);
		btnShow.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View view) {
				showTANC(
						"This is my custom dialog box",
						"TextContent/nWhen a dialog is requested for the first time," +
						" Android calls onCreateDialog(int)  from your Activity, " +
						"which is where you should instantiate the Dialog. " +
						"This callback method is passed the same ID that you passed to showDialog(int)." +
						" After you create the Dialog, return the object at the end of the method.",
						"http://blog.csdn.net/sodino");
			}
		});
	}
	private void showTANC(String header, String content, String url) {
		final Dialog dialog = new Dialog(MainActivity.this,R.style.Tantransparent);
		dialog.setContentView(R.layout.main_dialog);
		dialog.setTitle(header);
		dialog.setCancelable(true);
		TextView textView01 = (TextView) dialog.findViewById(R.id.TextView01);
		textView01.setText(content + content + content);
		Button btnCancel = (Button) dialog.findViewById(R.id.btnCancel);
		btnCancel.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View view) {
				dialog.cancel();
			}
		});
		dialog.show();
	}
}

效果圖:

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