android简单的夜间模式

现在android项目values下打

attrs.xml

<?xml version="1.0" encoding="utf-8"?> <resources> <attr name="bookimage" format="reference|color" /> <attr name="tvcolor" format="reference|color" /> </resources>

style.xml

<?xml version="1.0" encoding="utf-8"?> <resources> <!-- 默认风格 --> <style name="BrowserThemeDefault" parent="@android:style/Theme.Black.NoTitleBar"> <item name="bookimage">@android:color/white</item> <item name="tvcolor">@android:color/darker_gray</item> </style> <!-- 夜间模式 --> <style name="BrowserThemeNight" parent="@android:style/Theme.Black.NoTitleBar"> <item name="bookimage">@android:color/transparent</item> <item name="tvcolor">@android:color/white</item> </style> </resources>

layout下activity_main

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" //界面颜色改变 android:background="?bookimage" >   <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" //字体颜色改变 android:textColor="?tvcolor"/> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" //监听方法 android:onClick="btonclick" android:text="日/夜间模式切换" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView1" android:layout_centerHorizontal="true" android:layout_marginTop="116dp" android:onClick="btonclick2" android:text="跳转其他页面" /> </RelativeLayout>

MainActivity

package com.example.zdndemo;   import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; public class MainActivity extends Activity { private static boolean blFlag = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); SharedPreferences preferences = getSharedPreferences("default_night", MODE_PRIVATE); blFlag = preferences.getBoolean("default_night",true); if (blFlag) { this.setTheme(R.style.BrowserThemeDefault); } else { this.setTheme(R.style.BrowserThemeNight); } //上面的代码必须要放在setContentView之上 setContentView(R.layout.activity_main); } public void btonclick(View view) { SharedPreferences preferences = getSharedPreferences("default_night",MODE_PRIVATE); Editor editor = preferences.edit(); if (blFlag) { this.setTheme(R.style.BrowserThemeNight); blFlag =false; editor.putBoolean("default_night",false); } else { this.setTheme(R.style.BrowserThemeDefault); blFlag = true; editor.putBoolean("default_night",true); } // 提交修改 editor.commit(); this.setContentView(R.layout.activity_main); //不行的话在跳下本页面 } public void btonclick2(View view) { Intent intent = new Intent(); intent.setClass(this, breakactivity.class); startActivity(intent); } }