网站维护的意义大数据营销系统怎么样

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程序的安装与卸载在实际开发中也很常见，尤其是安装，在版本更新中必然会有。直接上示例：

MainActivity：

package com.home.installanduninstall;import java.io.File;import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener {private Button installBtn;private Button uninstallBtn;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);installBtn = (Button) findViewById(R.id.main_btn_install);uninstallBtn = (Button) findViewById(R.id.main_btn_uninstall);installBtn.setOnClickListener(this);uninstallBtn.setOnClickListener(this);}@Overridepublic void onClick(View v) {if (v == installBtn) {install();}if (v == uninstallBtn) {uninstall();}}/*** 安装应用程序*/private void install() {if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {Toast.makeText(this, "请插入SD卡", Toast.LENGTH_SHORT).show();return;}File sdCardDir = Environment.getExternalStorageDirectory();File file = new File(sdCardDir, "Sport.apk");if (!file.exists()) {Toast.makeText(this, "文件未找到", Toast.LENGTH_SHORT).show();return;}Uri uri = Uri.fromFile(file);Intent intent = new Intent(Intent.ACTION_VIEW);intent.setDataAndType(uri, "application/vnd.android.package-archive");startActivity(intent);}/*** 卸载应用程序*/private void uninstall() {Uri uri = Uri.parse("package:com.lovo.sport");Intent intent = new Intent(Intent.ACTION_DELETE, uri);startActivity(intent);}}

布局xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><Buttonandroid:id="@+id/main_btn_install"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="安装" /><Buttonandroid:id="@+id/main_btn_uninstall"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="卸载" /></LinearLayout>