标签：android
今天群里聊天说是实现白天夜晚模式切换不好搞，网上看了一下净是些设置theme的。仔细想了一下，白天夜晚模式的切换无非就是重新设置空间的背景色与字体颜色，如果这样的话，用broadcast receiver不是一个很好的实现方式吗？
上代码：
新建一个工程DayAndNightDemo。打开fragment_main.xml添加一个Button.
<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="com.example.dayandnightdemo.MainActivity$PlaceholderFragment" >
<TextView
android:id="@+id/main_hello"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/main_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="@string/jump" />
</RelativeLayout><menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.dayandnightdemo.MainActivity" >
<item
android:id="@+id/action_settings"
android:orderInCategory="100"
android:title="@string/action_settings"
app:showAsAction="never"/>
<item
android:id="@+id/action_change"
android:orderInCategory="100"
app:showAsAction="never"/>
</menu>package com.example.dayandnightdemo;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
/**
* （用的比较新的ADT）,最下面会有demo链接，导入自己的项目中的时候记得导入你自己的appcompat_v7，
* 具体方法是鼠标右键DayAndNightDemo--》Properties--》Android--》Library--》remove--》add。
*
* @author Administrator
*
*/
public class MainActivity extends ActionBarActivity {
private static MenuItem changeItem;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
changeItem = menu.findItem(R.id.action_change);
if (!Util.flag)// 夜晚
changeItem.setTitle(R.string.action_change_day);
else
changeItem.setTitle(R.string.action_change_night);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
} else if (id == R.id.action_change) {
Intent intent = new Intent();
if (item.getTitle().toString()
.equals(getString(R.string.action_change_night)))
Util.flag = false;// 夜晚
else if (item.getTitle().toString()
.equals(getString(R.string.action_change_day)))
Util.flag = true;// 白天
intent.setAction(Util.filter);
this.sendBroadcast(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
View rootView;
TextView helloText;
Button button;
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
if (!Util.flag) {
rootView.setBackgroundColor(Color.BLACK);
helloText.setBackgroundColor(Color.BLACK);
helloText.setTextColor(Color.WHITE);
button.setBackgroundColor(Color.DKGRAY);
button.setTextColor(Color.WHITE);
MainActivity.changeItem
.setTitle(R.string.action_change_day);
} else if (Util.flag) {
rootView.setBackgroundColor(Color.WHITE);
helloText.setBackgroundColor(Color.WHITE);
helloText.setTextColor(Color.BLACK);
button.setBackgroundColor(Color.GRAY);
button.setTextColor(Color.BLACK);
MainActivity.changeItem
.setTitle(R.string.action_change_night);
}
}
};
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_main, container,
false);
helloText = (TextView) rootView.findViewById(R.id.main_hello);
button = (Button) rootView.findViewById(R.id.main_btn);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(getActivity(),
SecondActivity.class);
getActivity().startActivity(intent);
}
});
IntentFilter filter = new IntentFilter();
filter.addAction(Util.filter);
getActivity().registerReceiver(receiver, filter);
return rootView;
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
getActivity().unregisterReceiver(receiver);
android.os.Process.killProcess(android.os.Process.myPid());
}
}
}
package com.example.dayandnightdemo;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.LinearLayout;
import android.widget.TextView;
public class SecondActivity extends ActionBarActivity {
private LinearLayout linear;
private TextView text;
private MenuItem changeItem;
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
changeItem = menu.findItem(R.id.action_change);
if (!Util.flag)// 夜晚
changeItem.setTitle(R.string.action_change_day);
else
changeItem.setTitle(R.string.action_change_night);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
} else if (id == R.id.action_change) {
Intent intent = new Intent();
if (item.getTitle().toString()
.equals(getString(R.string.action_change_night)))
Util.flag = false;// 夜晚
else if (item.getTitle().toString()
.equals(getString(R.string.action_change_day)))
Util.flag = true;// 白天
intent.setAction(Util.filter);
this.sendBroadcast(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
init();
IntentFilter filter = new IntentFilter();
filter.addAction(Util.filter);
registerReceiver(receiver, filter);
}
private void init() {
// TODO Auto-generated method stub
linear = (LinearLayout) findViewById(R.id.second_linear);
text = (TextView) findViewById(R.id.second_text);
if (!Util.flag)// 夜晚
{
linear.setBackgroundColor(Color.BLACK);
text.setBackgroundColor(Color.BLACK);
text.setTextColor(Color.WHITE);
}
}
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
if (!Util.flag) {
linear.setBackgroundColor(Color.BLACK);
text.setBackgroundColor(Color.BLACK);
text.setTextColor(Color.WHITE);
changeItem.setTitle(R.string.action_change_day);
} else if (Util.flag) {
linear.setBackgroundColor(Color.WHITE);
text.setBackgroundColor(Color.WHITE);
text.setTextColor(Color.BLACK);
changeItem.setTitle(R.string.action_change_night);
}
}
};
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(receiver);
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.dayandnightdemo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.dayandnightdemo.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.example.dayandnightdemo.SecondActivity" />
</application>
</manifest>package com.example.dayandnightdemo;
public class Util {
public static String filter = "com.example.dayandnightdemo.change";
public static boolean flag = true;// true表示白天模式，false表示夜晚模式
}
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">DayAndNightDemo</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string name="action_change_night">夜晚</string>
<string name="action_change_day">白天</string>
<string name="jump">跳转</string>
<string name="second_activity">这是个第二个activity</string>
</resources>
标签：android
原文地址：http://blog.csdn.net/qmln31821007/article/details/42870441
