android > 弹出 Activity

在 Act1 上弹出 一个窗口，窗口内容为 Act2

Act1 source: 其中里面有个遍历 judgealert 用来做标示判断，目的是在oncreate 时 不执行 onresume

package t1.com;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class T1Activity extends Activity {
    /** Called when the activity is first created. */
	private Button at;
	
	private boolean judgealert ;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        judgealert = false;
        at = (Button)findViewById(R.id.at);
        at.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				// TODO Auto-generated method stub
				judgealert = true;
				Intent intent = new Intent();
				intent.setClass(T1Activity.this, AlertAct.class);
				T1Activity.this.startActivity(intent);
				
			}
		});
        
    }

    
    @Override
    protected void onResume() {
    	// TODO Auto-generated method stub
    	super.onResume();
    	if(judgealert == true){
    		Toast.makeText(T1Activity.this, "弹出窗口关闭咯", Toast.LENGTH_LONG).show();
    	}
    	judgealert = false;
    	
    	
    }

    
    
    
}

Act1 layout 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

	<Button 
	    android:id="@+id/at"
	    android:layout_width="fill_parent"	
	    android:layout_height="wrap_content"
	    android:text="弹出"
	    />
</LinearLayout>

 

Act2 source:

package t1.com;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;


public class AlertAct extends Activity {
    /** Called when the activity is first created. */
	private Button close;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.alert);
        close = (Button)findViewById(R.id.close);
        
        close.setOnClickListener(new View.OnClickListener() {
			
			public void onClick(View v) {
				// TODO Auto-generated method stub
				AlertAct.this.finish();
			}
		});
        
       
    }
}

Act2 layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

	<TextView 
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:text="hello.. i am alert!"
	    />
	
	
	<Button 
	    android:id="@+id/close"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:text="关闭"
	    />
</LinearLayout>

 

在 Manifest 中 要给予 Act2 属性     android:theme="@android:style/Theme.Dialog"

另外  弹出 Act 也可以自定义 窗口属性 放在Act2 中

     Dialog dialog = new Dialog(LoginAddSensor.this);
    Window dialogWindow = dialog.getWindow();
     WindowManager m = getWindowManager();
     Display d = m.getDefaultDisplay();
     WindowManager.LayoutParams p = getWindow().getAttributes();
     p.width = (int)(d.getWidth()*0.8);

     p.alpha = 0.8f;
     dialogWindow.setAttributes(p);

-----------------------------------------------

** 解决弹出窗口去掉标题栏 

 先在 res/values/styles.xml 中新建 style

<?xml version="1.0" encoding="UTF-8"?>
<resources>
	<style name="myDialogTheme" parent="android:Theme.Dialog">
	        <item name="android:windowFrame">@null</item>
	        <item name="android:windowIsFloating">true</item>
	        <item name="android:windowIsTranslucent">false</item> 
	        <item name="android:windowNoTitle">true</item><!--除去title-->
	        <item name="android:windowContentOverlay">@null</item> 
	        <item name="android:backgroundDimEnabled">false</item>
	        <item name="android:windowBackground">@null</item><!--除去背景色-->
	
	</style>   
</resources>

 

然后在 Manifest 中 的 Activity 加载 Theme

android:theme="@style/myDialogTheme"   即可

也可以在里面定义 字体颜色 如下通用 的 Activity Theme

<?xml version="1.0" encoding="UTF-8"?>
<resources>
	<style name="globalActTheme" parent="android:Theme.Translucent.NoTitleBar">
	        <item name="android:textColor">#ff0000</item>
	
	</style>   
</resources>