需求

在我们的应用程序里，启动其他的应用程序。

思路

我们称呼 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.获得 一个 “启动intent"。
使用 getPackageManager().getLaunchIntentForPackage(packageName);
该方法会返回一个”可以启动该应用程序的intent“
3.启动 intent.
startActivity(intent);

那么其实，我们仅仅是 需要一个参数： packageName 。

实现

布局

    <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>

代码

    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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