Android--手机卫士涉及的知识点总结（三）
可扩展的ListView（ExpandableListView控件）
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public
class
QuerryUsualNumber
extends
Activity {
private
ExpandableListView exl_listview;
private
SQLiteDatabase db;
private
TextView tv;
private
MyExpandableAdapter adapter;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
db=SQLiteDatabase.openDatabase(
"/data/data/com.cca.mobilephone/files/commonnum.db"
,
null
, SQLiteDatabase.OPEN_READONLY);
setContentView(R.layout.activity_querryusualnumber);
exl_listview = (ExpandableListView) findViewById(R.id.exl_listview);
adapter =
new
MyExpandableAdapter();
//设置适配器
exl_listview.setAdapter(adapter);
//孩子被点击的监听器
exl_listview.setOnChildClickListener(
new
OnChildClickListener() {
@Override
public
boolean
onChildClick(ExpandableListView parent, View v,
int
groupPosition,
int
childPosition,
long
id) {
//点击条目获得数据库返回的数据，并分割提取号码进行拨号
String data=UsualNumberDao.getChildrenNameByPosition(db, groupPosition, childPosition);
String datas[]=data.split(
"\n"
);
String name=datas[
0
];
String number=datas[
1
];
Toast.makeText(getApplicationContext(), groupPosition+
"--"
+childPosition+
":"
+name+
":"
+number,
0
).show();
//点击之后进行拨打指定号码的电话
Intent intent =
new
Intent();
intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse(
"tel:"
+number));
startActivity(intent);
return
true
;
}
});
}
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适配器
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private
class
MyExpandableAdapter
extends
BaseExpandableListAdapter{
/**
* 获取分组的个数
*/
@Override
public
int
getGroupCount() {
return
UsualNumberDao.getGroupCount(db);
}
/**
* 获取每个分组的孩子的个数
*/
@Override
public
int
getChildrenCount(
int
groupPosition) {
return
UsualNumberDao.getChildGroupCount(db,groupPosition);
}
@Override
public
Object getGroup(
int
groupPosition) {
return
null
;
}
@Override
public
Object getChild(
int
groupPosition,
int
childPosition) {
return
null
;
}
@Override
public
long
getGroupId(
int
groupPosition) {
return
0
;
}
@Override
public
long
getChildId(
int
groupPosition,
int
childPosition) {
return
0
;
}
@Override
public
boolean
hasStableIds() {
return
false
;
}
/**
* 返回每个分组的view对象
*/
@Override
public
View getGroupView(
int
groupPosition,
boolean
isExpanded,
View convertView, ViewGroup parent) {
//TextView tv;
if
(convertView==
null
){
tv=
new
TextView(QuerryUsualNumber.
this
);
}
else
{
tv=(TextView) convertView;
}
tv.setTextSize(
25
);
tv.setTextColor(Color.RED);
tv.setText(
" "
+UsualNumberDao.getNameByGroupCountposition(db,groupPosition));
return
tv;
}
@Override
public
View getChildView(
int
groupPosition,
int
childPosition,
boolean
isLastChild, View convertView, ViewGroup parent) {
if
(convertView==
null
){
tv=
new
TextView(QuerryUsualNumber.
this
);
}
else
{
tv=(TextView) convertView;
}
tv.setTextSize(
20
);
tv.setTextColor(Color.BLACK);
tv.setText(
" "
+UsualNumberDao.getChildrenNameByPosition(db,groupPosition, childPosition));
return
tv;
}
@Override
public
boolean
isChildSelectable(
int
groupPosition,
int
childPosition) {
return
true
;
}
}
@Override
protected
void
onDestroy() {
super
.onDestroy();
db.close();
}
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接口回调解耦的应用（用短信备份加进度条对话框来举例）
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/**
* 短信备份
*
* @param view
*/
public
void
SMSBackUp(View view) {
/**
* 直接弹出一个进度条对话框
*/
final
ProgressDialog pb =
new
ProgressDialog(
this
);
pb.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pb.setMessage(
"正在备份......"
);
pb.show();
// show出来才能看得见
new
Thread() {
public
void
run() {
boolean
result = SMSTool.SmsBackup(
new
SMSTool.SmsBackupCallBack() {
/**
* 接口里面的方法
*/
@Override
public
void
callBackprogress(
int
progress) {
pb.setProgress(progress);
}
/**
* 接口里面的方法
*/
@Override
public
void
callBackMax(
int
max) {
pb.setMax(max);
}
}, ToolActivity.
this
,
"back.xml"
);
if
(result) {
ToastUtils.show(ToolActivity.
this
,
"备份成功"
);
}
else
{
ToastUtils.show(ToolActivity.
this
,
"备份失败"
);
}
pb.dismiss();
// 是否备份成功对话框都消失
};
}.start();
}
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短信备份的逻辑：
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/**
* 短信备份的工具类
*
* @author Administrator
*
*/
public
class
SMSTool {
/**
* 接口回调，定义一些抽象方法
*
* @author Administrator
*
*/
public
interface
SmsBackupCallBack {
/**
* 接口回调
*
* @param max 最大值
*
*/
public
abstract
void
callBackMax(
int
max);
/**
* 接口回调
*
* @param progress
*/
public
abstract
void
callBackprogress(
int
progress);
}
/**
* 短信备份的业务逻辑
*
* @param context 上下文
*
* @param filename 存进的文件名
*
* @return
*/
public
static
boolean
SmsBackup(SmsBackupCallBack callBack,
Context context, String filename) {
try
{
ContentResolver resolver = context.getContentResolver();
Cursor cursor = resolver.query(uri,
new
String[] {
"address"
,
"date"
,
"body"
,
"type"
},
null
,
null
,
null
);
File file =
new
File(Environment.getExternalStorageDirectory(),
filename);
FileOutputStream fos =
new
FileOutputStream(file);
XmlSerializer serialer = Xml.newSerializer();
// 设置序列化参数
serialer.setOutput(fos,
"utf-8"
);
serialer.startDocument(
"utf-8"
,
true
);
serialer.startTag(
null
,
"info"
);
cursor.moveToNext();
int
max = cursor.getCount();
int
progress =
0
;
//接口方法
callBack.callBackMax(max);
while
(cursor.moveToNext()) {
// cursor.moveToNext();
serialer.startTag(
null
,
"sms"
);
serialer.startTag(
null
,
"address"
);
String address = cursor.getString(
0
);
serialer.text(address);
serialer.endTag(
null
,
"address"
);
serialer.startTag(
null
,
"date"
);
String date = cursor.getString(
1
);
serialer.text(date);
serialer.endTag(
null
,
"date"
);
serialer.startTag(
null
,
"body"
);
String body = cursor.getString(
2
);
serialer.text(body);
serialer.endTag(
null
,
"body"
);
serialer.startTag(
null
,
"type"
);
String type = cursor.getString(
3
);
serialer.text(type);
serialer.endTag(
null
,
"type"
);
serialer.endTag(
null
,
"sms"
);
progress++;
//接口的方法
callBack.callBackprogress(progress);
}
cursor.close();
serialer.startTag(
null
,
"info"
);
serialer.endDocument();
return
true
;
}
catch
(Exception e) {
e.printStackTrace();
return
false
;
}
}
}
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短信备份常见错误
org.kxml2.io.KXmlSerializer.text(KXmlSerializer.java:536)这是因为短信的内容中存在着搜狗输入法的一些表情，无法识别，只要把带有表情符号的短信删除掉就可以成功备份
java.io.FileNotFoundException:
/storage/emulated/0/backup.xml: 07-22 10:56:50.440: W/System.err(305): at
open failed: EACCES (Permission denied)没有权限齐全，短信的读写，sd卡、内存卡的读写权限等
listview的优化：四大原则
1、时间换空间
（牺牲时间换取空间，流的读写）
2、空间换时间
（把文件的路径存进数据库，以后查询就快很多，Android下的图库应用检索）
3、时间换时间
（开机启动速度的优化）
4、空间换空间
把内存换成硬盘，或者把硬盘换成内存
获取手机中所有应用程序的关键信息以List
返回List集合对象
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public
class
AppManagerInfos {
@SuppressWarnings
(
"unused"
)
public
static
List getAppManagerInfos(Context context) {
List appinfos =
new
ArrayList();
PackageManager pm = context.getPackageManager();
//获取安装在手机上的应用程序
List<packageinfo> infos = pm.getInstalledPackages(
0
);
for
(PackageInfo appInfo : infos) {
AppInfo info =
new
AppInfo();
// 获得包名
String packagename = appInfo.packageName;
info.setPakageName(packagename);
// 获得应用名称
String appname = appInfo.applicationInfo.loadLabel(pm).toString();
info.setAppname(appname);
// 获得应用图标
Drawable icon = appInfo.applicationInfo.loadIcon(pm);
info.setIcon(icon);
// 获得应用app的绝对路径
String path = appInfo.applicationInfo.sourceDir;
info.setPath(path);
// 获得应用app的大小
File file =
new
File(path);
long
size = file.length();
String sizedata = Formatter.formatFileSize(context, size);
info.setSize(size);
int
flag = appInfo.applicationInfo.flags;
if
((flag & ApplicationInfo.FLAG_SYSTEM) ==
0
) {
// 用户应用
info.setUserapp(
true
);
}
else
{
// 系统应用
info.setUserapp(
false
);
}
if
((flag & ApplicationInfo.FLAG_EXTERNAL_STORAGE) ==
0
) {
// 存在手机内存
info.setInRom(
true
);
}
else
{
// 存在sd内存卡
info.setInRom(
false
);
}
appinfos.add(info);
}
return
appinfos;
}
}
</packageinfo></appinfo></appinfo></appinfo>
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把不同集合数据展示到ListView中
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public
class
AppManagerActivity
extends
Activity {
private
TextView tv_shji_byte;
private
TextView tv_sd_byte;
private
ListView lv_listview;
private
LinearLayout ll_loading;
private
List infos;
private
List userapp;
private
List systemapp;
private
Handler handler =
new
Handler() {
public
void
handleMessage(android.os.Message msg) {
lv_listview.setAdapter(
new
MyAppManagerAdapter());
ll_loading.setVisibility(View.INVISIBLE);
};
};
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_app_manager);
tv_shji_byte = (TextView) findViewById(R.id.tv_shji_byte);
tv_sd_byte = (TextView) findViewById(R.id.tv_sd_byte);
lv_listview = (ListView) findViewById(R.id.lv_listview);
ll_loading = (LinearLayout) findViewById(R.id.ll_loading);
userapp =
new
ArrayList();
systemapp =
new
ArrayList();
File datafile = Environment.getDataDirectory();
long
datasize = datafile.getFreeSpace();
File sdfile = Environment.getExternalStorageDirectory();
long
sdsize = sdfile.getFreeSpace();
tv_shji_byte.setText(
"手机可用内存"
+ Formatter.formatFileSize(
this
, datasize));
tv_sd_byte.setText(
"sd卡可用内存"
+ Formatter.formatFileSize(
this
, sdsize));
fillData();
}
/**
* 填充数据
*/
private
void
fillData() {
new
Thread() {
public
void
run() {
infos = AppManagerInfos
.getAppManagerInfos(AppManagerActivity.
this
);
for
(AppInfo info : infos) {
if
(info.isUserapp()) {
// 用户程序
userapp.add(info);
}
else
{
systemapp.add(info);
// 系统程序
}
}
handler.sendEmptyMessage(
0
);
};
}.start();
}
private
class
MyAppManagerAdapter
extends
BaseAdapter {
@Override
public
int
getCount() {
return
userapp.size() + systemapp.size() +
2
;
}
@Override
public
View getView(
int
position, View convertView, ViewGroup parent) {
View view;
HoldView holder;
if
(convertView !=
null
&& convertView
instanceof
RelativeLayout) {
view = convertView;
holder = (HoldView) view.getTag();
}
else
{
holder =
new
HoldView();
view = View.inflate(AppManagerActivity.
this
,
R.layout.item_app_manager,
null
);
holder.app_name = (TextView) view.findViewById(R.id.app_name);
holder.app_location = (TextView) view
.findViewById(R.id.app_location);
holder.app_icon = (ImageView) view.findViewById(R.id.app_icom);
holder.app_size = (TextView) view.findViewById(R.id.app_size);
view.setTag(holder);
}
AppInfo info;
if
(position ==
0
) {
// 显示textView用户程序
TextView tv_user =
new
TextView(AppManagerActivity.
this
);
tv_user.setTextSize(
15
);
tv_user.setBackgroundColor(Color.GREEN);
tv_user.setTextColor(Color.BLACK);
tv_user.setText(
"用户程序"
+ userapp.size() +
"个"
);
return
tv_user;
}
else
if
(position == userapp.size() +
1
) {
TextView tv_system =
new
TextView(AppManagerActivity.
this
);
tv_system.setTextSize(
15
);
tv_system.setBackgroundColor(Color.GREEN);
tv_system.setTextColor(Color.BLACK);
tv_system.setText(
"系统程序"
+ systemapp.size() +
"个"
);
return
tv_system;
}
else
if
(position < userapp.size() +
1
) {
// 用户程序
info = userapp.get(position -
1
);
}
else
{
// 系统程序
info = systemapp.get(position -
2
- userapp.size());
}
holder.app_name.setText(info.getAppname());
holder.app_icon.setImageDrawable(info.getIcon());
holder.app_size.setText(Formatter.formatFileSize(
AppManagerActivity.
this
, info.getSize()) +
"M"
);
if
(info.isInRom()) {
holder.app_location.setText(
"手机内存"
);
}
else
{
holder.app_location.setText(
"sd卡储存"
);
}
return
view;
}
@Override
public
Object getItem(
int
position) {
return
null
;
}
@Override
public
long
getItemId(
int
position) {
return
0
;
}
private
class
HoldView {
TextView app_name;
TextView app_location;
ImageView app_icon;
TextView app_size;
}
}
</appinfo></appinfo></appinfo></appinfo></appinfo>
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设置listview属性可使其快速滚动
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android:fastScrollEnabled=
"true"
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在listview滚动时悬浮标识符
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在帧布局中加入一个TextView
<textview android:background=
"#00FF00"
android:id=
"@+id/tv_biaoshi"
android:layout_height=
"wrap_content"
android:layout_width=
"match_parent"
android:text=
"用户程序"
android:textcolor=
"#000000"
android:textsize=
"15sp"
>
</textview>
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不过设置属性时需要和之前区分系统用户时的属性相同，背景色、字体、大小，这样才可以重合
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TextView tv_biaoshi=(TextView) findViewById(R.id.tv_biaoshi);
/**
* 给listview注册一个滚动监听器
*/
lv_listview.setOnScrollListener(
new
OnScrollListener() {
/**
* 当状态发生改变时执行此方法
*/
@Override
public
void
onScrollStateChanged(AbsListView view,
int
scrollState) {
}
/**
* 当listview滚动时执行此方法
*/
@Override
public
void
onScroll(AbsListView view,
int
firstVisibleItem,
int
visibleItemCount,
int
totalItemCount) {
if
(firstVisibleItem>userapp.size()){
tv_biaoshi.setText(
"系统程序"
+systemapp.size()+
"个"
);
}
else
{
tv_biaoshi.setText(
"用户程序"
+userapp.size()+
"个"
);
}
}
});
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悬浮窗体的创建使用（轻量级的对话框，内存开销比对话框小，灵活）漂浮的容器，在activity上方
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//点击条目弹出悬浮窗体
TextView convertView=
new
TextView(AppManagerActivity.
this
);
convertView.setTextSize(
15
);
convertView.setTextColor(Color.RED);
convertView.setText(info.getPakageName());
popupwindow =
new
PopupWindow(convertView,
300
,
100
);
popupwindow.setBackgroundDrawable(
new
ColorDrawable(Color.GREEN));
//获取点击的条目view对象到窗体的宽高(左上对齐)存在location中x、y
int
[]location=
new
int
[
2
];
view.getLocationInWindow(location);
popupwindow.showAtLocation(parent, Gravity.TOP+Gravity.LEFT,
80
, location[
1
]);
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不过一般都是自定义悬浮窗体
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View convertView=View.inflate(getApplicationContext(), R.layout.item_app_popupwindow,
null
);
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布局文件item.app.popupwindow.xml
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<!--?xml version=
"1.0"
encoding=
"utf-8"
?-->
<linearlayout android:background=
"@drawable/tip_bg"
android:layout_height=
"wrap_content"
android:layout_width=
"wrap_content"
android:orientation=
"horizontal"
xmlns:android=
"http://schemas.android.com/apk/res/android"
>
<linearlayout android:layout_height=
"wrap_content"
android:layout_marginleft=
"5dp"
android:layout_margintop=
"5dp"
android:layout_width=
"wrap_content"
android:orientation=
"vertical"
>
<imageview android:layout_height=
"wrap_content"
android:layout_margintop=
"5dp"
android:layout_width=
"wrap_content"
android:src=
"@drawable/my_user_exit"
>
<textview android:layout_height=
"wrap_content"
android:layout_marginbottom=
"3dp"
android:layout_width=
"wrap_content"
android:text=
"启动"
>
</textview></imageview></linearlayout>
<linearlayout android:layout_height=
"wrap_content"
android:layout_marginleft=
"5dp"
android:layout_margintop=
"5dp"
android:layout_width=
"wrap_content"
android:orientation=
"vertical"
>
<imageview android:layout_height=
"wrap_content"
android:layout_margintop=
"5dp"
android:layout_width=
"wrap_content"
android:src=
"@drawable/delete"
>
<textview android:layout_height=
"wrap_content"
android:layout_marginbottom=
"3dp"
android:layout_width=
"wrap_content"
android:text=
"删除"
>
</textview></imageview></linearlayout>
<linearlayout android:layout_height=
"wrap_content"
android:layout_marginleft=
"5dp"
android:layout_width=
"wrap_content"
android:orientation=
"vertical"
>
<imageview android:layout_height=
"wrap_content"
android:layout_width=
"wrap_content"
android:src=
"@drawable/wx_share_friends"
>
<textview android:layout_height=
"wrap_content"
android:layout_marginbottom=
"3dp"
android:layout_width=
"wrap_content"
android:text=
"分享"
>
</textview></imageview></linearlayout>
<linearlayout android:layout_height=
"wrap_content"
android:layout_marginleft=
"5dp"
android:layout_margintop=
"5dp"
android:layout_width=
"wrap_content"
android:orientation=
"vertical"
>
<imageview android:layout_height=
"wrap_content"
android:layout_margintop=
"5dp"
android:layout_width=
"wrap_content"
android:src=
"@drawable/datasafety_item_icon_config"
>
<textview android:layout_height=
"wrap_content"
android:layout_marginbottom=
"3dp"
android:layout_width=
"wrap_content"
android:text=
"信息"
>
</textview></imageview></linearlayout>
</linearlayout>
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保证窗体中只有一个悬浮窗体，每次弹出前执行判断；listview滚动时消失也执行此方法
public
void
dismissPopupwindow() {
if
(popupwindow!=
null
&& popupwindow.isShowing()){
popupwindow.dismiss();
popupwindow=
null
;
}
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动画的播放原理
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确定一个变化的函数：
根据这个函数 动态计算在某个时间应该显示什么画面
Canvas Bitmap 要求界面的窗体必须有背景，所以悬浮窗体必须设置背景才能启动动画
}
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一键分享
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//发送纯文本
Intent intent=
new
Intent();
intent.setAction(Intent.ACTION_SEND);
intent.addCategory(
"android.intent.category.DEFAULT"
);
intent.setType(
"text/plain"
);
//intent.setType("image/*");//图片
//intent.setType("video/*");//音频、视频
//intent.setType("*/*");//所有类型
intent.putExtra(Intent.EXTRA_TEXT,
"请使用这款软件"
);
startActivity(intent);
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一键卸载
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动态注册广播接收者
innerReceiver=
new
InnerUninstallAppReceiver();
IntentFilter filter=
new
IntentFilter();
filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
filter.addDataScheme(
"package"
);
registerReceiver(innerReceiver, filter);
/**
* 卸载软件程序后需要更新数据注册一个广播接收者
*/
private
void
uninstallapp() {
if
(info.isUserapp()){
Intent intent=
new
Intent();
intent.setAction(Intent.ACTION_DELETE);
intent.setData(Uri.parse(
"package:"
+info.getPakageName()));
startActivity(intent);
}
else
{
ToastUtils.show(
this
,
"应用程序需要root权限才能卸载"
);
}
}
/**
* 内部类，广播接收者，监听软件卸载的事件
* @author Administrator
*
*/
private
class
InnerUninstallAppReceiver
extends
BroadcastReceiver{
@Override
public
void
onReceive(Context context, Intent intent) {
if
(info.isUserapp()){
userapp.remove(info);
}
else
{
systemapp.remove(info);
}
adapter.notifyDataSetChanged();
}
}
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一键启动软件
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/**
* 打开软件的功能
*/
public
void
openApp() {
PackageManager pm=getPackageManager();
Intent intent=pm.getLaunchIntentForPackage(info.getPakageName());
if
(intent!=
null
){
startActivity(intent);
}
else
{
ToastUtils.show(
this
,
"软件无法启动！"
);
}
}
|
查看应用程序信息（也可卸载应用程序：系统的设置卸载界面）
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/**
* 查看应用程序全部信息
*/
private
void
showApp() {
//查找上层应用程序源码
/*
<category android:name="android.intent.category.DEFAULT">
<data android:scheme="package">*/
Intent intent =
new
Intent();
intent.setAction(
"android.settings.APPLICATION_DETAILS_SETTINGS"
);
intent.addCategory(
"android.intent.category.DEFAULT"
);
intent.setData(Uri.parse(
"package:"
+info.getPakageName()));
startActivity(intent);
}
</data></category></action>
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