Android版本更新下載提示對話框

Android手機版本更新，使用okhttp網絡框架進行網絡請求和文件下載操作，使用Handler線程處理progress進度的實時更新，下載之後用戶進行選擇安裝新版本，點擊手機返回鍵或者對話框取消按鈕取消文件下載，代碼簡單易懂，適合初學者，可以直接使用。

第一次寫博客，如有不足之處敬請指教。下面先看效果。

1.首先，得去清單文件配置好權限。

<!-- 允許程序接入網絡 --> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />

2.由於這裏使用到了okhttp框架，所以還要去gradle裏面加上

compile 'com.squareup.okhttp3:okhttp:3.4.1'

3.寫對話框的佈局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:background="#00000000"
    android:gravity="center"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="30dp"
        android:background="@color/white"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/yellowstroke_radiustop3"
            android:gravity="center"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/notify_title_tv"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="center_vertical"
                android:paddingLeft="10dp"
                android:text="發現新版本"
                android:textColor="@color/white"
                android:textSize="16sp" />

            <TextView
                android:id="@+id/update_cancel_tv"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:padding="10dp"
                android:text="取消"
                android:textColor="@color/white" />
        </LinearLayout>


        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="提醒"
            android:textColor="@color/colorAccent"
            android:textSize="16sp"
            android:visibility="gone" />

        <LinearLayout
            android:id="@+id/progress_linear"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:padding="15dp">

            <ProgressBar
                android:id="@+id/progressBar"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="fill_parent"
                android:layout_height="10dp"
                android:layout_gravity="center_vertical"
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:layout_weight="1"
                android:max="100"
                android:progress="0"
                android:progressDrawable="@drawable/download_progress" />

            <TextView
                android:id="@+id/progress_tv"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:layout_marginRight="10dp"
                android:text="下載進度：0%"
                android:textColor="#333333"
                android:textSize="12sp" />
        </LinearLayout>

    </LinearLayout>

</LinearLayout>

4.寫Activity的相關功能實現的代碼

package com.dyl.downloadprogressdialog;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ProgressBar;
import android.widget.TextView;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Dispatcher;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends Activity {
    public static final String HTTP_DOWNLOAD_TEST = "http://o1.exmmw.cn/uploads/soft/20160511/xiamiyy.apk";
    public static final String HTTP_BAIDU_URL = "https://www.baidu.com/";

    private OkHttpClient client = new OkHttpClient();
    private ProgressBar apkprogressBar;

    private TextView mDownloadTv, progress_tv;
    private int fileSize, downLoadFileSize;
    private Dialog versionDialog;

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

        mDownloadTv = findViewById(R.id.download);
        mDownloadTv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                VersionCheck();
            }
        });
    }

    private Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 0:
                    int p = (int) (((float) msg.arg1 / (float) fileSize) * 100);
                    apkprogressBar.setProgress(p);
                    progress_tv.setText("下載進度：" + p + "%");
                    break;
                case 1:
                    versionUpdatePop();
                    break;
            }
        }
    };

    //版本檢查
    private void VersionCheck() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Request request = new Request.Builder().tag("getVersionName").url(HTTP_BAIDU_URL)//請求接口。如果需要傳參拼接到接口後面。
                            .build();//創建Request 對象
                    Response response = null;
                    response = client.newCall(request).execute();//得到Response 對象
                    if (response.isSuccessful()) {
                        String myStr = "response.code()=" + response.code() + "\n+response.message()==" + response.body().string();
                        PackageManager packageManager = getPackageManager();
                        PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(), 0);
                        if (!packInfo.versionName.equals(String.valueOf(response.code()))) {
                            Message msg = new Message();
                            msg.what = 1;
                            handler.sendMessage(msg);
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

    // 版本升級彈出框
    private void versionUpdatePop() {
        versionDialog = new AlertDialog.Builder(MainActivity.this).create();
        versionDialog.show();
        Window window = versionDialog.getWindow();
        window.setContentView(R.layout.dialog_download);
        window.setLayout(android.view.ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

        apkprogressBar = (ProgressBar) window.findViewById(R.id.progressBar);
        TextView update_cancel_tv = (TextView) window.findViewById(R.id.update_cancel_tv);
        progress_tv = (TextView) window.findViewById(R.id.progress_tv);

        update_cancel_tv.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                cancelAll("download");
                versionDialog.cancel();
            }
        });

        downloadFile(HTTP_DOWNLOAD_TEST);
    }

    /**
     * 下載文件
     */
    private void downloadFile(String url) {
        Request request = new Request.Builder().url(url).tag("download").build();
        client.newCall(request).enqueue(new Callback() {

            @Override
            public void onFailure(Call call, IOException e) {
                if (e.toString().contains("closed")) {
                    //如果是主動取消的情況下
                    call.cancel();
                } else {

                }
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.isSuccessful()) {
                    try {
                        InputStream is = response.body().byteStream();
                        fileSize = new Long(response.body().contentLength()).intValue();
                        String mDestFileDir = Environment.getExternalStorageDirectory() + "/";
                        String mdestFileName = "Test.apk";
                        File dir = new File(mDestFileDir);
                        if (!dir.exists()) {
                            dir.mkdirs();
                        }
                        File file = new File(dir, mdestFileName);
                        FileOutputStream fos = new FileOutputStream(file);
                        byte[] buf = new byte[1024 * 8];
                        int len = 0;
                        downLoadFileSize = 0;
                        while ((len = is.read(buf)) != -1) {
                            fos.write(buf, 0, len);
                            downLoadFileSize += len;
                            Message msg = new Message();
                            msg.what = 0;
                            msg.arg1 = downLoadFileSize;
                            handler.sendMessage(msg);
                        }
                        fos.flush();
                        update(mDestFileDir + mdestFileName);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        });
    }

    // 安裝應用
    private void update(String filename) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(new File(filename)), "application/vnd.android.package-archive");// app.getVersionName()
        startActivity(intent);
    }

    //取消指定標籤的的網絡請求
    private void cancelAll(Object tag) {
        Dispatcher dispatcher = client.dispatcher();
        if (tag != null) {
            synchronized (dispatcher) {
                for (Call call : dispatcher.queuedCalls()) {
                    if (tag.equals(call.request().tag())) {
                        call.cancel();
                    }
                }
                for (Call call : dispatcher.runningCalls()) {
                    if (tag.equals(call.request().tag())) {
                        call.cancel();
                    }
                }
            }
        } else {
            dispatcher.cancelAll();
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        //點擊返回鍵去掉版本升級
        if (versionDialog != null && versionDialog.isShowing()) {
            cancelAll("download");
            versionDialog.cancel();
        }
        return super.onKeyDown(keyCode, event);
    }
}

代碼就是這麼簡單，如果還是不清楚可以下載下面的源碼文件直接使用，如有疑問，歡迎提出。

或者在這裏下載：點擊打開鏈接