手机卫士开发第八天

手机卫士第八天知识点

进程管理器的开发

一、获取可用内存和总内存的信息

public class SysInfoProvider {

public static long getAvailableMemory(Context context) {

ActivityManager am = (ActivityManager) context

.getSystemService(Context.ACTIVITY_SERVICE);

MemoryInfo outInfo = new MemoryInfo();

am.getMemoryInfo(outInfo);

return outInfo.availMem;

}

public static long getTotalMemory(Context context) {

/**

* 第一种方式（API 16+）

*/

// ActivityManager am = (ActivityManager) context

// .getSystemService(Context.ACTIVITY_SERVICE);

// MemoryInfo outInfo = new MemoryInfo();

// am.getMemoryInfo(outInfo);

/**

* 第二种方式

*/

long totalMem = 0l;

try {

BufferedReader reader = new BufferedReader(new FileReader(new File(

"/proc/meminfo")));

String info = reader.readLine();

StringBuilder builder = new StringBuilder(20);

for (char c : info.toCharArray()) {

if (c >= '0' && c <= '9') {

builder.append(c);

}

}

totalMem = Long.parseLong(builder.toString());

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return totalMem * 1024;

}

}

二、使用ActivityManager和PackageInfo类得到正在运行的进程的信息

public class ProcessInfoManager {

public static List<ProcessInfo> listProcessInfos(Context context) {

PackageManager pm = context.getPackageManager();

ActivityManager am = (ActivityManager) context

.getSystemService(Context.ACTIVITY_SERVICE);

List<RunningAppProcessInfo> runningAppProcessInfos = am

.getRunningAppProcesses();

ProcessInfo processInfo = null;

List<ProcessInfo> infos = new ArrayList<ProcessInfo>();

for (RunningAppProcessInfo runningInfo : runningAppProcessInfos) {

processInfo = new ProcessInfo();

// 得到包名或者是进程名

String packageName = runningInfo.processName;

// 得到进程的内存信息

MemoryInfo memInfo = (am

.getProcessMemoryInfo(new int[] { runningInfo.pid }))[0];

processInfo.setMemSize(memInfo.getTotalPrivateDirty() * 1024);

ApplicationInfo appInfo = null;

try {

appInfo = pm.getApplicationInfo(packageName, 0);

processInfo.setIcon(appInfo.loadIcon(pm));

processInfo.setName(appInfo.loadLabel(pm).toString());

processInfo.setPackageName(packageName);

processInfo

.setUserApp((appInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0);

} catch (NameNotFoundException e) {

// e.printStackTrace();

processInfo.setIcon(context.getResources().getDrawable(

R.drawable.ic_app_default));

processInfo.setName(packageName);

processInfo.setPackageName(packageName);

processInfo.setUserApp(false);

}

infos.add(processInfo);

}

return infos;

}

}

三、为了提高ListView的效率所以复用了convertView。这样的化Item里面的CheckedBox如果不加验证会出现错误。一般情况下是在业务Bean里面增加字段来记录它自己的选中状态。

四、Weight的使用，控件的属性中width=”0dp”那么weight代表的就是宽度的比例。如果height=”0dp”那么weight代表就是高度的优先级。

布局代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background_color"
android:orientation="vertical" >

<!-- 该Activity是程序开始的一个软件管理界面 -->

<TextView
style="@style/titile_context_app"
android:text="进程管理" />
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="30dp" >
<TextView
android:id="@+id/tv_count_process"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:gravity="center"
android:text="进程总数：60"
android:textSize="14sp" />

<TextView
android:id="@+id/tv_ava_total_space"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
android:gravity="center"
android:text="剩余/总内存：98/500MB"
android:textSize="14sp" />
</RelativeLayout>

<TextView
android:id="@+id/tv_groupinfo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:color/black"
android:text="用户进程：9个"
android:textColor="@android:color/white"
android:textSize="16sp" />

<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<LinearLayout
android:id="@+id/ll_loading_in_taskmanager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#aaffffff"
android:gravity="center"
android:orientation="vertical"
android:visibility="visible" >

<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正在玩命加载中..." />
</LinearLayout>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ListView
android:id="@+id/lv_list_all_process"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1000" >
</ListView>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<Button
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="cleanUp"
android:text="清理" />

<Button
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="checkAll"
android:text="全选" />

<Button
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="checkOppo"
android:text="反选" />

<Button
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="showSetting"
android:text="设置" />
</LinearLayout>
</LinearLayout>
</FrameLayout>

</LinearLayout>

效果如下：



五、选择显示系统进程只需要更改适配器代码里面的getCount方法即可。

class MyDapter extends BaseAdapter {

@Override
public int getCount() {
if (sp.getBoolean("isShowSysProcess", true)) {
return sysProcessInfos.size() + userProcessInfos.size() + 1;
}

return userProcessInfos.size();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (position == userProcessInfos.size()) {
TextView tv = new TextView(TaskManagerActivity.this);
tv.setBackgroundColor(Color.BLACK);
tv.setTextColor(Color.WHITE);
tv.setTextSize(16);
tv.setText("系统应用：共" + sysProcessInfos.size() + "个");
return tv;
} else {
if (convertView != null
&& convertView instanceof RelativeLayout) {
holder = (ViewHolder) convertView.getTag();
} else {
holder = new ViewHolder();
convertView = inflater.inflate(
R.layout.processinfo_item_show, null);
holder.cb_process_check = (CheckBox) convertView
.findViewById(R.id.cb_process_check);
holder.iv_process_icon = (ImageView) convertView
.findViewById(R.id.iv_process_icon);
holder.tv_process_memsize = (TextView) convertView
.findViewById(R.id.tv_process_memsize);
holder.tv_process_name = (TextView) convertView
.findViewById(R.id.tv_process_name);
convertView.setTag(holder);
}
if (position < userProcessInfos.size()) {
ProcessInfo info = userProcessInfos.get(position);
holder.cb_process_check.setChecked(info.isChecked());
holder.iv_process_icon.setImageDrawable(userProcessInfos
.get(position).getIcon());
holder.tv_process_memsize.setText(Formatter.formatFileSize(
TaskManagerActivity.this, info.getMemSize()));
holder.tv_process_name.setText(info.getName());
} else {
ProcessInfo info = sysProcessInfos.get(position
- userProcessInfos.size() - 1);
holder.cb_process_check.setChecked(info.isChecked());
holder.iv_process_icon.setImageDrawable(info.getIcon());
holder.tv_process_memsize.setText(Formatter.formatFileSize(
TaskManagerActivity.this, info.getMemSize()));
holder.tv_process_name.setText(info.getName());
}

return convertView;
}
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}

class ViewHolder {
ImageView iv_process_icon;
TextView tv_process_name;
TextView tv_process_memsize;
CheckBox cb_process_check;

}

}

六、锁屏清理进程。注意点锁屏广播是一个特殊的广播，只能在代码里面声明广播接收者不能再清单文件中声明广播接收者。

public class AutoCleanService extends Service {

private MyLockReceiver lockReceiver;
private ActivityManager am;

@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}

@Override
public void onCreate() {
am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
lockReceiver = new MyLockReceiver();
registerReceiver(lockReceiver, new IntentFilter(
Intent.ACTION_SCREEN_OFF));
Toast.makeText(this, "自动清理服务已经开启", 0).show();
super.onCreate();
}

@Override
public void onDestroy() {
unregisterReceiver(lockReceiver);
lockReceiver = null;
Toast.makeText(this, "自动清理服务已经销毁", 0).show();
super.onDestroy();
}

class MyLockReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
List<RunningAppProcessInfo> infos = am.getRunningAppProcesses();

for (RunningAppProcessInfo info : infos) {
// 不能自杀呀
if (!context.getPackageName().equals(info.processName)) {
am.killBackgroundProcesses(info.processName);
}
}
Toast.makeText(context, "旺旺卫士已经为您清理了进程", 0).show();
}
}

}

Widget控件的开发

一、新建一个AppWidgetProvider扩展类类，MyAppWidgetProvider

package com.example.phoneguard.receiver;

import com.example.phoneguard.service.AutoCleanService;
import com.example.phoneguard.service.UpdateWidgetService;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class MyAppWidgetProvider extends AppWidgetProvider {

}

二、编写widget控件的界面样式和布局代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#D8BFD8"
android:orientation="vertical" >

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<TextView
android:id="@+id/tv_process_count"
android:layout_width="200dp"
android:layout_height="35dp"
android:text="进程总数：共1个"
android:textColor="#000000" />

<TextView
android:id="@+id/tv_memsize_count"
android:layout_width="200dp"
android:layout_height="35dp"
android:layout_below="@id/tv_process_count"
android:text="可用内存：0MB"
android:textColor="#000000" />

<Button
android:id="@+id/btn_process_cleanup"
android:layout_width="90dp"
android:layout_height="30dp"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:background="#AFEEEE"
android:text="一键清理" />
</RelativeLayout>

</LinearLayout>

三、在RES/xml目录下建立元数据，列出该widget的信息

<?xml version="1.0" encoding="UTF-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:initialLayout="@layout/example_appwidget"
android:minHeight="72.0dip"
android:minWidth="294.0dip"
android:updatePeriodMillis="1800000" />

四、在清单文件注册该广播接收者

<receiver android:name=".receiver.MyAppWidgetProvider" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>

<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/my_appwidget_info" />
</receiver>

五、新建一个服务，用于更新Widget的UI显示。

package com.example.phoneguard.service;

import java.text.Normalizer.Form;
import java.util.Timer;
import java.util.TimerTask;

import com.example.phoneguard.R;
import com.example.phoneguard.engine.SysInfoProvider;
import com.example.phoneguard.receiver.MyAppWidgetProvider;

import android.app.ActivityManager;
import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.text.format.Formatter;
import android.view.View.OnCreateContextMenuListener;
import android.widget.RemoteViews;
import android.widget.Toast;
import android.widget.RemoteViews.RemoteView;

public class UpdateWidgetService extends Service {

private Timer timer;
private TimerTask task;
private AppWidgetManager appWidgetManager;
private ActivityManager am;

private MyLockReceiver lockReceiver;
private MyLockOffReceiver lockOffReceiver;

@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onCreate() {
lockOffReceiver = new MyLockOffReceiver();
// 接收设备唤醒的广播
registerReceiver(lockOffReceiver, new IntentFilter(
Intent.ACTION_USER_PRESENT));
lockReceiver = new MyLockReceiver();
// 接收设备锁定的广播
registerReceiver(lockReceiver, new IntentFilter(
Intent.ACTION_SCREEN_OFF));

updateWidget(5000);

}

public void updateWidget(long time) {
timer = new Timer();
task = new TimerTask() {
private ComponentName provider = new ComponentName(
getApplicationContext(), MyAppWidgetProvider.class);

@Override
public void run() {

// 设置远程视图
RemoteViews views = new RemoteViews(getPackageName(),
R.layout.example_appwidget);
am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
appWidgetManager = AppWidgetManager
.getInstance(getApplicationContext());

views.setTextViewText(R.id.tv_process_count, "进程总数：共"
+ am.getRunningAppProcesses().size() + "个");
long memsize = SysInfoProvider
.getAvailableMemory(getApplicationContext());
views.setTextViewText(
R.id.tv_memsize_count,
"可用内存："
+ Formatter.formatFileSize(
getApplicationContext(), memsize));
Intent intent = new Intent();
intent.setAction("com.example.phoneguard.cleanup");
PendingIntent pendingIntent = PendingIntent.getBroadcast(
getApplicationContext(), 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.btn_process_cleanup,
pendingIntent);
// 应用远程视图
appWidgetManager.updateAppWidget(provider, views);
System.out.println("更新Widget方法执行下...");
}
};
// 启动任务，0从现在开始，time 间隔time毫秒执行下任务方法
timer.schedule(task, 0, time);
}

@Override
public void onDestroy() {

Toast.makeText(this, "更新Widget的服务已经销毁...", 0).show();
unregisterReceiver(lockOffReceiver);
unregisterReceiver(lockReceiver);
lockOffReceiver = null;
lockReceiver = null;
timer.cancel();
task = null;
timer = null;
super.onDestroy();
}

class MyLockReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

// System.out.println("屏幕已经锁定，停止更新widget");
timer.cancel();
task = null;
timer = null;
}

}

class MyLockOffReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

// System.out.println("屏幕已经解锁，开始更新widget...");
updateWidget(5000);
}

}

}

六、MyAppWidgetProvider中控制上诉上面那个服务的生命周期

package com.example.phoneguard.receiver;

import com.example.phoneguard.service.AutoCleanService;
import com.example.phoneguard.service.UpdateWidgetService;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class MyAppWidgetProvider extends AppWidgetProvider {
private static final String TAG = "MyAppWidgetProvider";
private Intent itt;

@Override
public void onReceive(Context context, Intent intent) {
System.out.println("onReceive");
// 广播接收者收到了广播
itt = new Intent(context, UpdateWidgetService.class);
context.startService(itt);
super.onReceive(context, intent);
}

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
System.out.println("onUpdate");
// 广播接收者更新了
super.onUpdate(context, appWidgetManager, appWidgetIds);
}

@Override
public void onEnabled(Context context) {
System.out.println("onEnabled");
// 启用更新Widget的服务
itt = new Intent(context, UpdateWidgetService.class);
context.startService(itt);
super.onEnabled(context);
}

@Override
public void onDisabled(Context context) {
System.out.println("onDisabled");
// 禁用更新Widget的服务
context.stopService(itt);
super.onDisabled(context);
}

}