最新项目中需要启动第三方App，代码很简单，调用对应的API即可，主要是获取包名。可以使用sdk下自带的aapt来获取应用的一些信息。

1.首先要配置aapt的环境变量，否则会报命令没有发现。

使用open命令打开.bash_profile文件，在文件末尾追加以下代码行

1.  AAPT_HOME=/Users/du/Library/Android/sdk/build-tools/27.0.1  
2.  export AAPT_HOME  
3.  export PATH=$PATH:$AAPT_HOME

把AAPT_HOME换成自己的路径，27.0.1 可以是build-tools下面的任意一个版本

2.通过aapt dump badging命令获取App信息

aapt dump badging apkPath //apkPath:安装包的路径

下面以京东为例：

EDZdeMacBook-Pro:~ gfd$ aapt dump badging /Users/fj/Downloads/JDpad.apk
package: name='com.jingdong.app.mall' versionCode='57940' versionName='6.6.9' platformBuildVersionName='8.0.0'
sdkVersion:'14'
targetSdkVersion:'25'
uses-permission: name='android.permission.INTERNET'
uses-permission: name='android.permission.ACCESS_WIFI_STATE'
uses-permission: name='android.permission.ACCESS_NETWORK_STATE'
uses-permission: name='android.permission.ACCESS_NETWORK_STATE'
uses-permission: name='android.permission.READ_PHONE_STATE'
uses-permission: name='android.permission.CALL_PHONE'
uses-permission: name='android.permission.CAMERA'
uses-permission: name='android.permission.FLASHLIGHT'
uses-permission: name='android.permission.VIBRATE'
uses-permission: name='android.permission.WRITE_EXTERNAL_STORAGE'
uses-permission: name='android.permission.READ_EXTERNAL_STORAGE'
uses-permission: name='android.permission.MOUNT_UNMOUNT_FILESYSTEMS'
uses-permission: name='android.permission.DOWNLOAD_WITHOUT_NOTIFICATION'
uses-permission: name='com.android.launcher.permission.INSTALL_SHORTCUT'
uses-permission: name='com.android.launcher.permission.UNINSTALL_SHORTCUT'
uses-permission: name='android.permission.RESTART_PACKAGES'
uses-permission: name='android.permission.RECEIVE_BOOT_COMPLETED'
uses-permission: name='android.permission.GET_TASKS'
uses-permission: name='android.permission.KILL_BACKGROUND_PROCESSES'
uses-permission: name='android.permission.READ_CONTACTS'
uses-permission: name='android.permission.RECORD_AUDIO'
uses-permission: name='android.permission.ACCESS_COARSE_LOCATION'
uses-permission: name='android.permission.ACCESS_FINE_LOCATION'
uses-permission: name='android.permission.ACCESS_LOCATION_EXTRA_COMMANDS'
uses-permission: name='android.permission.READ_LOGS'
uses-permission: name='android.permission.EXPAND_STATUS_BAR'
uses-permission: name='android.permission.MODIFY_AUDIO_SETTINGS'
uses-permission: name='android.permission.WAKE_LOCK'
uses-permission: name='android.permission.SYSTEM_ALERT_WINDOW'
uses-permission: name='com.jingdong.app.mall.permission.self_broadcast'
uses-permission: name='com.jingdong.app.mall.permission.MIPUSH_RECEIVE'
uses-permission: name='android.permission.INTERACT_ACROSS_USERS'
uses-permission: name='android.permission.INTERACT_ACROSS_USERS_FULL'
uses-permission: name='com.meizu.flyme.push.permission.RECEIVE'
uses-permission: name='com.jingdong.app.mall.push.permission.MESSAGE'
uses-permission: name='com.meizu.c2dm.permission.RECEIVE'
uses-permission: name='com.jingdong.app.mall.permission.C2D_MESSAGE'
uses-permission: name='getui.permission.GetuiService.com.jingdong.app.mall'
uses-permission: name='android.permission.RECEIVE_USER_PRESENT'
uses-permission: name='android.permission.BROADCAST_STICKY'
uses-permission: name='android.permission.BLUETOOTH'
uses-permission: name='android.permission.BATTERY_STATS'
uses-permission: name='android.permission.DISABLE_KEYGUARD'
uses-permission: name='com.jd.permissions.MSG_BROADCAST'
uses-permission: name='android.permission.NFC'
uses-permission: name='android.permission.BLUETOOTH_ADMIN'
uses-permission: name='android.permission.BLUETOOTH_ADMIN'
uses-permission: name='android.permission.CHANGE_WIFI_MULTICAST_STATE'
uses-permission: name='android.permission.CHANGE_NETWORK_STATE'
uses-permission: name='android.permission.CHANGE_WIFI_STATE'
uses-permission: name='com.android.launcher.permission.READ_SETTINGS'
uses-permission: name='com.coloros.mcs.permission.RECIEVE_MCS_MESSAGE'
uses-permission: name='android.permission.USE_FINGERPRINT'
application-label:'京东'
application-icon-120:'r/b/jd_buy_icon.png'
application-icon-160:'r/b/jd_buy_icon.png'
application-icon-240:'r/b/jd_buy_icon.png'
application-icon-320:'r/u/jd_buy_icon.png'
application-icon-400:'r/s/jd_buy_icon.png'
application-icon-420:'r/s/jd_buy_icon.png'
application-icon-480:'r/s/jd_buy_icon.png'
application-icon-560:'r/k/jd_buy_icon.png'
application-icon-640:'r/k/jd_buy_icon.png'
application-icon-65534:'r/b/jd_buy_icon.png'
application-icon-65535:'r/k/jd_buy_icon.png'
application: label='京东' icon='r/b/jd_buy_icon.png'
launchable-activity: name='com.jingdong.app.mall.main.MainActivity'  label='' icon=''
aapt(850,0x7fff9aa9f3c0) malloc: *** error for object 0x2: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6
EDZdeMacBook-Pro:~ gfd$ 

从上面我们可以看到package 和launchable-activity，有这两个信息我们就可以在自己的应用里启动它了。

3.通过Intent启动第三方App

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
ComponentName cn = new ComponentName("com.jingdong.app.mall",
                "com.jingdong.app.mall.main.MainActivity");
intent.setComponent(cn);
if (intent.resolveActivityInfo(context.getPackageManager(), PackageManager.MATCH_DEFAULT_ONLY) != null) {//启动的intent存在
          context.startActivity(intent);
} else {
      Toast.makeText(context, "应用未安装", Toast.LENGTH_SHORT).show();
}

intent.resolveActivityInfo(context.getPackageManager(), PackageManager.MATCH_DEFAULT_ONLY) != null是用来判断启动app是否安装了。看到网上很多都是获取packageInfo = this.getPackageManager().getPackageInfo(pkgName, 0);，然后通过判断packageInfo是否为空来判断是否安装过来。该Api在高版本上会报错。

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