下载安装Apk

这个demo主要是做判断版本并在网上下载并安装apk

需要导入xutils3架包

Mainactivity（主界面 进行一些操作）

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import org.xutils.common.Callback;
import org.xutils.http.RequestParams;
import org.xutils.x;

import java.io.File;

public class MainActivity extends AppCompatActivity {
    private int versionCode;
    private ProgressDialog progressDialog;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        PackageManager packageManager = getPackageManager();
        try {
            PackageInfo packageInfo = packageManager.getPackageInfo(getPackageName(), 0);
            versionCode = packageInfo.versionCode;
            showUpdate();
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
    }


    private void showUpdate() {
        new AlertDialog.Builder(this)
                .setTitle("更新版本")
                .setMessage("当前版本是" + versionCode + " 需要升级")
                .setPositiveButton("下载", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        downloadApk();
                    }
                })
                .setNegativeButton("取消", null)
                .create()
                .show();
    }

    private void downloadApk() {
        String url = "http://gdown.baidu.com/data/wisegame/f98d235e39e29031/baiduxinwen.apk";
        String path = Environment.getExternalStorageDirectory().getPath() + "/teme1/myapk.apk";
        File file = new File(path);
        File parentFile = file.getParentFile();
        if (!parentFile.exists()) {
            parentFile.mkdir();
        }

        RequestParams params = new RequestParams(url);
        params.setAutoRename(false);
        params.setAutoResume(true);

        //设置保存路径
        params.setSaveFilePath(path);
        x.http().get(params, new Callback.ProgressCallback<File>() {
            @Override
            public void onSuccess(File result) {
                installDownloadApk(result);
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {

            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onFinished() {
                cancleProgressDialog();
            }

            @Override
            public void onWaiting() {

            }

            @Override
            public void onStarted() {
                showProgressDialog();
            }

            @Override
            public void onLoading(long total, long current, boolean isDownloading) {
                int progress = (int) (current / total * 100);
                if (progress >= 0 && progress <= 100) {
                    updataProgressDialog(progress);
                }
            }
        });
    }

    //安卓开发 apk安装
    private void installDownloadApk(File result) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setDataAndType(Uri.fromFile(result), "application/vnd.android.package-archive");
        startActivity(intent);
    }

    private void cancleProgressDialog() {
        if (progressDialog == null) {
            return;
        }
        if (progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
    }

    private void updataProgressDialog(int progress) {
        if (progressDialog == null) {
            return;
        }
        progressDialog.setProgress(progress);
    }

    private void showProgressDialog() {
        progressDialog = new ProgressDialog(this);

        //设置progressDialog显示样式
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressDialog.setMessage("我正在下载东西");
        progressDialog.setTitle("请等待");
        progressDialog.setProgress(0);
        progressDialog.show();
    }

}

MyApplication（配置xutils3）

package com.example.lixin.downloadapkdemo.app;

import android.app.Application;

import org.xutils.x;

/**
 * Created by hua on 2017/8/19.
 */

public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        x.Ext.init(this);
    }
}

manifest（配置文件）

xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.lixin.downloadapkdemo">
    android:name="android.permission.INTERNET"/>
    android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <application
        android:name=".app.MyApplication"
        android:allowBackup="true" android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true" android:theme="@style/AppTheme">
        android:name=".MainActivity">
            
                android:name="android.intent.action.MAIN" />

                android:name="android.intent.category.LAUNCHER" />
            
        
    application>