android launch应用，读取app列表然后打开相应的app

功能：实现读取手机上的所有app列表，根据业务的需要再加过滤条件即可，点击相应的图标可以打开相应的app。

先看下效果：



3个文件，代码如下 。
MainActivity.java

package com.example.testlaunch;

import java.util.List;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {
private List<ResolveInfo> appList;
private GridView gvApps;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

loadApps();
setContentView(R.layout.activity_main);
gvApps = (GridView) findViewById(R.id.gv_app);
gvApps.setAdapter(new AppsAdapter());

gvApps.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
ResolveInfo info = appList.get(position);

// 该应用的包名
String pkg = info.activityInfo.packageName;
// 该应用的主activity类
String cls = info.activityInfo.name;

ComponentName componet = new ComponentName(pkg, cls);

Intent intent = new Intent();
intent.setComponent(componet);
startActivity(intent);
}
});
}

/**
* 读取所有的app
* @Title:loadApps
*/
private void loadApps() {
Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
appList = getPackageManager().queryIntentActivities(mainIntent, 0);
}

public class AppsAdapter extends BaseAdapter {

public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
TextView textView;

if (convertView == null) {
convertView = LayoutInflater.from(MainActivity.this)
.inflate(R.layout.list_launch, parent, false);
}
imageView = (ImageView) convertView.findViewById(R.id.iv_launch);
textView = (TextView) convertView.findViewById(R.id.tv_launch);

ResolveInfo info = appList.get(position);
imageView.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));
textView.setText(info.activityInfo.loadLabel(getPackageManager()));
return convertView;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return appList.size();
}

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

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

}
}

activity_main.xml

<?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:orientation="vertical" >

<GridView
android:id="@+id/gv_app"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:numColumns="3" >
</GridView>

</LinearLayout>

list_launch.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="100dp"
android:layout_height="100dp"
android:gravity="center"
android:orientation="vertical" >

<ImageView
android:id="@+id/iv_launch"
android:layout_width="80dp"
android:layout_height="80dp" />

<TextView
android:id="@+id/tv_launch"
android:layout_width="wrap_content"
android:singleLine="true"
android:layout_height="wrap_content" />

</LinearLayout>