API Demos 2.2 研读笔记(5)——Window Feature
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 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。
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。
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