android开发(16) 遍历所有的已经安装的应用程序，启动其他的应用程序

得到一个需求：想再我们的应用程序里调用其他的应用程序。

做出尝试后，我的方法时这样：

我们先把 即将调用的应用程序成为 目标应用程序 

1.获得目标应用的 包名（ packageName）

2.使用 getPackageManager().getLaunchIntentForPackage(packageName); 获得 一个 “启动intent"，该方法会返回一个”可以启动该应用程序的intent“

3.启动 该intent.   startActivity(intent); 

那么其实，我们仅仅是 需要一个参数： packageName 。

开始贴代码。 

--------------------- 

<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"
    tools:context=".MainActivity" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true" >
    </ListView>
</RelativeLayout> 

 <?xml version="1.0" encoding="utf-8"?>



 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="60dp">

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/imageView1"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

package zyf.demo.processdemo;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;



import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.content.pm.ApplicationInfo;

import android.graphics.drawable.Drawable;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.ListView;

import android.widget.TextView;



public class MainActivity extends Activity {

    List<ApplicationInfo> packages;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        packages = getPackageManager().getInstalledApplications(0);



        ListView lv = (ListView) findViewById(R.id.listView1);

        lv.setAdapter(new MyAdapter());

        lv.setOnItemClickListener(new OnItemClickListener() {



            @Override

            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

                    long arg3) {

                ApplicationInfo appInfo = packages.get(arg2);

                Intent intent = getPackageManager().getLaunchIntentForPackage(

                        appInfo.packageName);

                startActivity(intent);

            }



        });

    }



    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.activity_main, menu);

        return true;

    }



    List<Map<String, Object>> list;



    class MyAdapter extends BaseAdapter {



        public void Query() {



        }



        @Override

        public int getCount() {

            // TODO Auto-generated method stub

            return packages.size();

        }



        @Override

        public Object getItem(int arg0) {

            // TODO Auto-generated method stub

            return null;

        }



        @Override

        public long getItemId(int arg0) {

            // TODO Auto-generated method stub

            return 0;

        }



        @Override

        public View getView(int arg0, View arg1, ViewGroup arg2) {

            View v = getLayoutInflater().inflate(R.layout.item, null);

            ImageView iv = (ImageView) v.findViewById(R.id.imageView1);

            TextView textview1 = (TextView) v.findViewById(R.id.textView1);

            TextView textview2 = (TextView) v.findViewById(R.id.textView2);



            // 获得包名

            ApplicationInfo app = (ApplicationInfo) packages.get(arg0);

            String packageName = app.packageName;



            textview2.setText(packageName);



            // 获得图标

            Drawable dr = getPackageManager().getApplicationIcon(app);

            iv.setImageDrawable(dr);



            String label = "";

            try {

                label = getPackageManager().getApplicationLabel(app).toString();

                textview1.setText(label);

            } catch (Exception e) {

                Log.i("Exception", e.toString());

            }

            return v;

        }



    }



}

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