来源: 互联网  发布时间: 2014-02-18

显示系统安装的应用程序列表
1.java代码
package eoe.appshow;


import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;


public class AppShowActivity extends Activity {
ListView lv;
MyAdapter adapter;
ArrayList<HashMap<String, Object>> items = new ArrayList<HashMap<String, Object>>();


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lv = (ListView)findViewById(R.id.lv);
//得到PackageManager对象
PackageManager pm = getPackageManager();
//得到系统安装的所有程序包的PackageInfo对象
//List<ApplicationInfo> packs = pm.getInstalledApplications(0);
List<PackageInfo> packs = pm.getInstalledPackages(0);
for(PackageInfo pi:packs)
{
HashMap<String, Object> map = new HashMap<String, Object>();
//显示用户安装的应用程序，而不显示系统程序
// if((pi.applicationInfo.flags&ApplicationInfo.FLAG_SYSTEM)==0&&
// (pi.applicationInfo.flags&ApplicationInfo.FLAG_UPDATED_SYSTEM_APP)==0)
// {
// //这将会显示所有安装的应用程序，包括系统应用程序
// map.put("icon", pi.applicationInfo.loadIcon(pm));//图标
// map.put("appName", pi.applicationInfo.loadLabel(pm));//应用程序名称
// map.put("packageName", pi.applicationInfo.packageName);//应用程序包名
// //循环读取并存到HashMap中，再增加到ArrayList上，一个HashMap就是一项
// items.add(map);
// }
//这将会显示所有安装的应用程序，包括系统应用程序
map.put("icon", pi.applicationInfo.loadIcon(pm));//图标
map.put("appName", pi.applicationInfo.loadLabel(pm));//应用程序名称
map.put("packageName", pi.applicationInfo.packageName);//应用程序包名
//循环读取并存到HashMap中，再增加到ArrayList上，一个HashMap就是一项
items.add(map);
}


/**
* 参数：Context
* ArrayList(item的集合)
* item的layout
* 包含ArrayList中的HashMap的key的数组
* key所对应的值的相应的控件id
*/
adapter = new MyAdapter(this, items, R.layout.piitem,
new String[]{"icon", "appName", "packageName"},
new int[]{R.id.icon, R.id.appName, R.id.packageName});
lv.setAdapter(adapter);
}
}

class MyAdapter extends SimpleAdapter
{
private int[] appTo;
private String[] appFrom;
private ViewBinder appViewBinder;
private List<? extends Map<String, ?>> appData;
private int appResource;
private LayoutInflater appInflater;
public MyAdapter(Context context, List<? extends Map<String, ?>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
appData = data;
appResource = resource;
appFrom = from;
appTo = to;
appInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}


public View getView(int position, View convertView, ViewGroup parent){
return createViewFromResource(position, convertView, parent, appResource);
}
private View createViewFromResource(int position, View convertView, ViewGroup parent, int resource){
View v;
if(convertView == null)
{
v = appInflater.inflate(resource, parent,false);
final int[] to = appTo;
final int count = to.length;
final View[] holder = new View[count];
for(int i = 0; i < count; i++)
{
holder[i] = v.findViewById(to[i]);
}
v.setTag(holder);
}else
{
v = convertView;
}
bindView(position, v);
return v;
}


private void bindView(int position, View view)
{
final Map dataSet = appData.get(position);
if(dataSet == null)
{
return;
}
final ViewBinder binder = appViewBinder;
final View[] holder = (View[])view.getTag();
final String[] from = appFrom;
final int[] to = appTo;
final int count = to.length;
for(int i = 0; i < count; i++)
{
final View v = holder[i];
if(v != null)
{
final Object data = dataSet.get(from[i]);
String text = data == null ? "":data.toString();
if(text == null)
{
text = "";
}
boolean bound = false;
if(binder != null)
{
bound = binder.setViewValue(v, data, text);
}
if(!bound)
{
/**
* 自定义适配器，关在在这里，根据传递过来的控件以及值的数据类型，
* 执行相应的方法，可以根据自己需要自行添加if语句。另外，CheckBox等
* 集成自TextView的控件也会被识别成TextView，这就需要判断值的类型
*/


if(v instanceof TextView)
{
//如果是TextView控件，则调用SimpleAdapter自带的方法，设置文本
setViewText((TextView)v, text);
}else if(v instanceof ImageView){
//如果是ImageView控件，调用自己写的方法，设置图片
setViewImage((ImageView)v, (Drawable)data);
}else{
throw new IllegalStateException(v.getClass().getName() + " is not a " + "view that can be bounds by this SimpleAdapter");
}
}
}
}
}
public void setViewImage(ImageView v, Drawable value){
v.setImageDrawable(value);
}
}
2.    main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView android:id="@+id/lv" android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
</LinearLayout>
3.piitem.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/icon"
android:layout_width="48dip"
android:layout_height="48dip" />
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/appName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/packageName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>

    

    来源: 互联网  发布时间: 2014-02-18

ColorMatrix给图片去掉饱和度变灰

ImageView iv = new ImageView(this);
        Drawable drawable = getResources().getDrawable(R.drawable.icon);
        drawable.mutate();
        ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);     
        ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm);     
        drawable.setColorFilter(cf);
        iv.setImageDrawable(drawable);
        setContentView(iv);

    

    来源: 互联网  发布时间: 2014-02-18

用proguard进行代码混淆
给自己的代码加上混淆，2.3之后android的sdk已经包含proguard了。
在eclipse下很简单，工程中已经有了proguard.cfg文件，在default.properties文件中加上
proguard.config=proguard.cfg， 重新export .apk文件即可。

期间遇到了一个问题，生成apk失败，报错
'C:\Program' is not recognized as an internal or external command
貌似是因为路径里还有空格的问题。我的是因为android sdk装在C:\program files 下了，

解决办法是在eclipse的菜单 Window > Preferences > Android > SDK Location，
修改成： C:\Progra~1\..\