应用的安装方式：adb install或者下载安装

过程分析请參考老罗的blog，这里记录一下第三方应用程序安装apk的过程。

安装的过程主要是调用PackageInstaller这个App，源码的位置在package/app/PackageInstaller

AndroidManifest.xml例如以下，

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

          package="com.android.packageinstaller">

    <original-package android:name="com.android.packageinstaller" />

    <uses-permission android:name="android.permission.INSTALL_PACKAGES" />

    <uses-permission android:name="android.permission.DELETE_PACKAGES" />

    <uses-permission android:name="android.permission.CLEAR_APP_CACHE" />

    <uses-permission android:name="android.permission.READ_PHONE_STATE" />

    <uses-permission android:name="android.permission.CLEAR_APP_USER_DATA" />

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <uses-permission android:name="android.permission.MANAGE_USERS" />

    <application android:label="@string/app_name"

            android:allowBackup="false"

            android:theme="@android:style/Theme.DeviceDefault.DialogWhenLarge.NoActionBar">

        <activity android:name=".PackageInstallerActivity"

                android:configChanges="orientation|keyboardHidden|screenSize"

                android:excludeFromRecents="true">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <action android:name="android.intent.action.INSTALL_PACKAGE" />

                <category android:name="android.intent.category.DEFAULT" />

                <data android:scheme="file" />

                <data android:mimeType="application/vnd.android.package-archive" />

            </intent-filter>

            <intent-filter>

                <action android:name="android.intent.action.INSTALL_PACKAGE" />

                <category android:name="android.intent.category.DEFAULT" />

                <data android:scheme="file" />

                <data android:scheme="package" />

            </intent-filter>

        </activity>

        <activity android:name=".InstallAppProgress"

                android:configChanges="orientation|keyboardHidden|screenSize">

        </activity>

        <activity android:name=".UninstallerActivity"

                android:configChanges="orientation|keyboardHidden|screenSize"

                android:excludeFromRecents="true"

                android:theme="@android:style/Theme.DeviceDefault.Dialog.NoActionBar">

            <intent-filter>

                <action android:name="android.intent.action.DELETE" />

                <action android:name="android.intent.action.UNINSTALL_PACKAGE" />

                <category android:name="android.intent.category.DEFAULT" />

                <data android:scheme="package" />

            </intent-filter>

        </activity>

        <activity android:name=".UninstallAppProgress"

                android:configChanges="orientation|keyboardHidden|screenSize">

        </activity>

        <!--

        <receiver android:name=".RemoveReceiver">

            <intent-filter>

                <action android:name="android.intent.action.PACKAGE_FULLY_REMOVED" />

                <data android:scheme="package" />

            </intent-filter>

        </receiver>

        -->

    </application>

</manifest> 

安装和卸载APP主要用到了PackageInstallerActivity和UninstallActivity。

安装一个应用程序的步骤例如以下：

String fileName = Environment.getExternalStorageDirectory() + "/myApp.apk";

Intent intent = new Intent(Intent.ACTION_VIEW);

intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive");

startActivity(intent); 

卸载一个应用程序的步骤例如以下：

Uri packageURI = Uri.parse("package:com.android.myapp");

Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);

startActivity(uninstallIntent);  

默认是不支持非市场安装的，这里可推断一下：

int result = Settings.Secure.getInt(getContentResolver(),

 Settings.Secure.INSTALL_NON_MARKET_APPS, 0);

if (result == 0) {

// show some dialog here

// ...

// and may be show application settings dialog manually

Intent intent = new Intent();

intent.setAction(Settings.ACTION_APPLICATION_SETTINGS);

startActivity(intent);

}