自定义标题栏

Android允许对手机屏幕的特征进行客户化，例如，客户化标题栏。如果我们想要对某一特征进行客户化，首先就要通过Window.requestFeature
(int featureId) 方法进行申请。一旦申请了就不能去掉这个特征了。

Android事先为可能被客户化的特征定义了常量。

int DEFAULT_FEATURES The default features
enabled

int FEATURE_CONTEXT_MENU Flag for the context menu.

int FEATURE_CUSTOM_TITLE Flag for custom title.

int FEATURE_INDETERMINATE_PROGRESS Flag for indeterminate
progress

int FEATURE_LEFT_ICON Flag for having an icon on the left side of
the title bar

int FEATURE_NO_TITLE Flag for the "no title" feature, turning off
the title at the top of the screen.

int FEATURE_OPTIONS_PANEL Flag for the "options panel"
feature.

int FEATURE_PROGRESS Flag for the progress indicator
feature

int FEATURE_RIGHT_ICON Flag for having an icon on the right side of
the title bar

下面以API Demo中Custom Title为例加以说明。

1. 首先创建客户化的title。

Xml代码

Xml代码

[html] view plaincopy

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/screen"

android:layout_width="match_parent" android:layout_height="match_parent"

android:orientation="vertical">

<TextView android:id="@+id/left_text"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:text="@string/custom_title_left" />

<TextView android:id="@+id/right_text"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentRight="true"

android:text="@string/custom_title_right" />

</RelativeLayout>

2. 在CustomTitle.java中将客户化的title应用到activity中。

Java代码

[java] view plaincopy

package com.example.android.apis.app;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.Window;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import com.example.android.apis.R;

public class CustomTitle extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

setContentView(R.layout.custom_title);

getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title_1);

final TextView leftText = (TextView) findViewById(R.id.left_text);

final TextView rightText = (TextView) findViewById(R.id.right_text);

final EditText leftTextEdit = (EditText) findViewById(R.id.left_text_edit);

final EditText rightTextEdit = (EditText) findViewById(R.id.right_text_edit);

Button leftButton = (Button) findViewById(R.id.left_text_button);

Button rightButton = (Button) findViewById(R.id.right_text_button);

leftButton.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

leftText.setText(leftTextEdit.getText());

}

});

rightButton.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

rightText.setText(rightTextEdit.getText());

}

});

}

}

先在setContentView之前调用requestWindowFeature(Window.FEATURE_CUSTOM_TITLE)，申请
对标题进行客户化。然后调用getWindow().setFeatureInt将新的title应用到activity上。

客户化window feature时需要注意：

1. 要在setContentView之前调用requestFeature。由于requestWindowFeature =
getWindow().requestFeature，所以调用requestWindowFeature 也可。

2. 不能将其他title相关feature与FEATURE_CUSTOM_TITLE一起使用。

3. 相关feature的官方文件： http://developer.android.com/reference/android/view/Window.html