1.直接通过URL下载安装APP：

示例：

零、准备工作
0.1第三方库
implementation ‘io.reactivex.rxjava2:rxjava:2.2.2’
implementation ‘io.reactivex.rxjava2:rxandroid:2.1.0’
implementation ‘io.reactivex.rxjava2:rxkotlin:2.3.0’
implementation ‘com.squareup.okhttp3:okhttp:3.11.0’
implementation ‘com.squareup.okio:okio:2.0.0’

0.2权限：

0.3格式
Code: 0,
Msg: ,
UpdateStatus: 1,
VersionCode: 3,
VersionName: 1.0.2,
ModifyContent: 1、优化API接口。\r\n2、添加使用演示示例。\r\n3、新增自定义更新服务API接口。\r\n4、优化更新提示界面。,
DownloadUrl: https://raw.githubusercontent.com/xuexiangjys/XUpdate/master/apk/xupdate_demo_1.0.2.apk,
ApkSize: 2048
“ApkMd5”: “…” //如果没有MD5值，无法保证APK是否完整，每次都会重新下载。

一、检测是否为最新版本，如果不是，则进行更新。
private Disposable downDisposable;
private ProgressBar progressBar;
private TextView textView4;
private Button upgrade;
private long downloadLength = 0;
private long contentLength = 0;
// 存储权限
private String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};

判断当前版本是否为最新版本，如果不是，则进行更新。

private void test(){
Observable.create(new ObservableOnSubscribe() {
@Override
public void subscribe(ObservableEmitter emitter) throws Exception {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(url)
.build();

client.newCall(request).enqueue(new okhttp3.Callback() {
@Override
public void onFailure(Call call, IOException e) {
emitter.onError(e);
}
}

@Override
public void onResponse(Call call, Response response) throws IOException {
String result=””;
if (response.body()!=null) {
result=response.body().string();
}else {
//返回数据错误
return;
}
emitter.onNext(result);
}
});
// emitter.onNext(“123”);
}
}).subscribeOn(Schedulers.io())// 将被观察者切换到子线程
.observeOn(AndroidSchedulers.mainThread())// 将观察者切换到主线程
.subscribe(new Observer<String>() {
private Disposable mDisposable;
@Override
public void onSubscribe(Disposable d) {
mDisposable = d;
}
@Override
public void onNext(String result) {
if (result.isEmpty()){
return;
}
//2.判断版本是否最新，如果不是最新版本则更新
String downloadUrl=”https://raw.githubusercontent.com/xuexiangjys/XUpdate/master/apk/xupdate_demo_1.0.2.apk”;
String ;
String size=”新版本大小：未知”;
String msg=”1、优化api接口。\r\n2、添加使用demo演示。\r\n3、新增自定义更新服务API接口。\r\n4、优化更新提示界面。”;
int versionCode=20000;
try {
int version = getPackageManager().
getPackageInfo(getPackageName(), 0).versionCode;
if (versionCode>version){
LayoutInflater inflater = LayoutInflater.from(TestActivity.this);
View view = inflater.inflate(R.layout.layout_dialog, null);
AlertDialog.Builder mDialog = new AlertDialog.Builder(TestActivity.this,R.style.Translucent_NoTitle);
mDialog.setView(view);
mDialog.setCancelable(true);
mDialog.setOnKeyListener(new DialogInterface.OnKeyListener() {
@Override
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
return keyCode == KeyEvent.KEYCODE_BACK;
}
});
upgrade= view.findViewById(R.id.button);
TextView textView1= view.findViewById(R.id.textView1);
TextView textView2= view.findViewById(R.id.textView2);
TextView textView3= view.findViewById(R.id.textView3);
textView4= view.findViewById(R.id.textView4);
ImageView iv_close= view.findViewById(R.id.iv_close);
progressBar= view.findViewById(R.id.progressBar);
progressBar.setMax(100);
textView1.setText(title);
textView2.setText(size);
textView3.setText(msg);
upgrade.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//动态询问是否授权
int permission = ActivityCompat.checkSelfPermission(getApplication(),
Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (permission != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(TestActivity.this, PERMISSIONS_STORAGE,
1);
}else {
upgrade.setVisibility(View.INVISIBLE);
down(downloadUrl);
}
}
});
iv_close.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
mDialog.show();
}else {

try {
throw new PackageManager.NameNotFoundException();
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
mDisposable.dispose();

}) {
});
}

下载apk并更新进度条。

private void down(String downloadUrl) {
Observable.create(new ObservableOnSubscribe() {
@Override
public void subscribe(ObservableEmitter emitter) throws Exception {
// Your code here
}
});
}

@Override
public void onSubscribe(Disposable d) {
downDisposable = d;
}
@Override
public void onNext(Integer result) {
//设置ProgressDialog 进度条进度
progressBar.setProgress(result);
textView4.setText(result+”%”);
}
@Override
public void onError(Throwable e) {
Toast.makeText(getApplication(),”网络异常！请重新下载！”,Toast.LENGTH_SHORT).show();
upgrade.setEnabled(true);
}
@Override
public void onComplete() {
Toast.makeText(getApplication(),”服务器异常！请重新下载！”,Toast.LENGTH_SHORT).show();
upgrade.setEnabled(true);
}) {
});
}

二、下载apk
//下载apk

private void downApk(String downloadUrl, ObservableEmitter emitter) {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(downloadUrl)
.build();
}

}

//断点续传

private void breakpoint(String downloadUrl,ObservableEmitter<Integer> emitter){
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(downloadUrl)
.addHeader(“RANGE”, “bytes=” + downloadLength + “-” + contentLength)
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
//下载失败
breakpoint(downloadUrl,emitter);
}

@Override
public void onResponse(Call call, Response response) throws IOException {
if (response.body() == null) {
// 下载失败
breakpoint(downloadUrl, emitter);
return;
}
InputStream is = null;
RandomAccessFile randomFile = null;
byte[] buff = new byte[2048];
int len;
try {
is = response.body().byteStream();
String root = Environment.getExternalStorageDirectory().getPath();
File file = new File(root, updateDemo.apk);
randomFile = new RandomAccessFile(file, rwd);
randomFile.seek(downloadLength);
long total = contentLength;
long sum = downloadLength;
while ((len=is.read(buff)) != -1) {
sum += len;
randomFile.write(buff, 0, len);
int progress=(int)(sum*1.0f/total*100);//下载进度
emitter.onNext(progress);//发送进度条数据给观察者，即MainActivity中的onNext方法接收到此数据后更新UI。
}
emitter.onComplete();//完成下载
} catch (Exception e) {
e.printStackTrace();
emitter.onError(e);
} finally {
try {
if(is!=null)
is.close();
if(randomAccessFile!=null)
randomAccessFile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

/**

路径为根目录，创建文件名称为updateDemo.apk。
“`java
private File createFile() {
String root = Environment.getExternalStorageDirectory().getPath();
File file = new File(root, updateDemo.apk);
if (file.exists()) {
file.delete();
}
try {
file.createNewFile();
return file;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
“`

三、安装apk
3.1 在项目的src/res目录下新建一个xml文件夹，并自定义一个file_paths文件。
3.2 在清单文件中进行配置。

public void installApk(Context context, File file) {
if (context == null) {
return;
}
String authority = getApplicationContext().getPackageName() + .fileProvider;
Uri apkUri = FileProvider.getUriForFile(context, authority, file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(apkUri, application/vnd.android.package-archive);
context.startActivity(intent);
}

“`
context.startActivity(intent);
//关闭原程序，以便在安装完成后点击打开时能够正常响应
Process.killProcess(android.os.Process.myPid());
}
“`
改写为：
“`java
context.startActivity(intent);
//关闭原程序，确保在安装完成后点击打开时能够立即响应
Process.killProcess(android.os.Process.myPid());
}
“`

四、取消订阅
@Override
protected void onDestroy() {
super.onDestroy();
downDisposable.dispose(); // 取消订阅
}

五、自定义对话框
5.1 用户界面
查看第一步，检测是否为最新版本，如果不是，则进行更新。

5.2布局
1

两种途径来更新安卓 APP

1.直接通过URL下载安装APP：

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1.直接通过URL下载安装APP：

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