注意：
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");这一句话中,第一个参数是要安装的apk的路径,第二个参数是apk所对应的类型。可以砸tomcat的安装目录下的conf目录下的web.xml中找到
程序运行截图：

代码实现如下：
1、main.xml
复制代码 代码如下:
<?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" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="安装"
android:onClick="install"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="卸载"
android:onClick="uninstall"
/>
</LinearLayout>

2、MainActivity
复制代码 代码如下:
package com.njupt.install;
import java.io.File;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void install(View v){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
File file = new File(Environment.getExternalStorageDirectory(),"HtmlUI1.apk");
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
startActivity(intent);
}
public void uninstall(View v){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_DELETE);
intent.setData(Uri.parse("package:com.njupt.htmlui1"));
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.main, menu);
return true;
}
}