android基础教程之夜间模式实现示例

package org.david.dayandnightdemo.cor;

import android.os.bundle;
import android.app.activity;
import android.content.context;
import android.content.sharedpreferences;
import android.content.sharedpreferences.editor;
import android.graphics.color;
import android.graphics.pixelformat;
import android.view.gravity;
import android.view.view;
import android.view.view.onclicklistener;
import android.view.windowmanager;
import android.view.windowmanager.layoutparams;
import android.widget.button;
import android.widget.textview;

public class mainactivity extends activity implements onclicklistener {

    private windowmanager mwindowmanager;
    private view myview;
    private button btn_dayandnight;
    private sharedpreferences skinsp;
    private final static string day = "day";
    private final static string night = "night";
    private int flage = 0;

    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        mwindowmanager = (windowmanager) getsystemservice(context.window_service);
        setcontentview(r.layout.activity_main);
        init();
    }

    private void init() {
        skinsp = this.getsharedpreferences("skinchange", context.mode_private);
        btn_dayandnight = (button) findviewbyid(r.id.btn_dayandnight);
        btn_dayandnight.setonclicklistener(this);

        string mode = skinsp.getstring("skin", "");
        if(mode!=null||!mode.equals("")){
            if(mode.equals(night)){
                night();
            }else{
                day();
            }
        }

    }

    @override
    public void onclick(view v) {
        if(flage%2==0){
            night();
            btn_dayandnight.settext("白天模式");
            btn_dayandnight.settextcolor(color.white);
            flage++;
        }else{
            day();
            btn_dayandnight.settext("夜间模式");
            btn_dayandnight.settextcolor(color.black);
            flage++;
        }
    }

    public void night() {
        windowmanager.layoutparams params = new windowmanager.layoutparams(
                layoutparams.fill_parent, layoutparams.fill_parent,
                layoutparams.type_application,
                windowmanager.layoutparams.flag_not_touchable
                        | windowmanager.layoutparams.flag_not_focusable,
                pixelformat.translucent);
        params.gravity=gravity.bottom;
        params.y=10;
        if(myview==null){
            myview=new textview(this);
            myview.setbackgroundcolor(0x80000000);
        }
        mwindowmanager.addview(myview, params);
        editor edit = skinsp.edit();
        edit.putstring("skin", night);
        edit.commit();
    }

    public void day(){
        if(myview!=null){
            mwindowmanager.removeview(myview);
            editor edit = skinsp.edit();
            edit.putstring("skin", day);
            edit.commit();
        }
    }

   
    public void removeskin(){
        if(myview!=null){
            mwindowmanager.removeview(myview);
        }
    }

    @override
    protected void ondestroy() {
        super.ondestroy();
        string mode = skinsp.getstring("skin", "");
        if(mode.equals(night)){
            removeskin();           
        }
    }

}

布局文件

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingbottom="@dimen/activity_vertical_margin"
    android:paddingleft="@dimen/activity_horizontal_margin"
    android:paddingright="@dimen/activity_horizontal_margin"
    android:paddingtop="@dimen/activity_vertical_margin"
    tools:context=".mainactivity" >

    <button
        android:id="@+id/btn_dayandnight"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/btn_changeskin" />

</relativelayout>