我们在开发中,会对标题进行操作,全屏操作,改变标题样式等等。我们可以通过requestWindowFeature(featrueId)来实现,它的功能是启用窗体的扩展特性。参数是Window类中定义的常量。
枚举常量
1.DEFAULT_FEATURES:系统默认状态,一般不需要指定
2.FEATURE_CONTEXT_MENU:启用ContextMenu,默认该项已启用,一般无需指定
3.FEATURE_CUSTOM_TITLE:自定义标题。当需要自定义标题时必须指定。如:标题是一个按钮时
4.FEATURE_INDETERMINATE_PROGRESS:不确定的进度
5.FEATURE_LEFT_ICON:标题栏左侧的图标
6.FEATURE_NO_TITLE:吴标题
7.FEATURE_OPTIONS_PANEL:启用“选项面板”功能,默认已启用。
8.FEATURE_PROGRESS:进度指示器功能
9.FEATURE_RIGHT_ICON:标题栏右侧的图标
自定义标题样式,这里用加载条来作例子:
Main.java
package com.action;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Window;
public class Main extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.main);
getWindow().setFeatureInt(Window.FEATURE_INDETERMINATE_PROGRESS, R.layout.progress);
setProgressBarIndeterminateVisibility(true);
new Thread(runnable).start();
}
private Runnable runnable = new Runnable(){
@Override
public void run() {
Message msg = new Message();
try {
Thread.sleep(1500);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.sendMessage(msg);
}
};
Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
setProgressBarIndeterminateVisibility(false);
super.handleMessage(msg);
}
};
}
progress.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"> <ProgressBar android:id="@+id/progress" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" style="?android:attr/progressBarStyleSmallTitle"> </ProgressBar> </LinearLayout>
全屏操作:
package com.action;
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
public class Main extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
setProgressBarIndeterminateVisibility(true);
}
}