APP下载更新，所有的APP都有这样的功能，在6.0之前都是这么写的：
Intent intents = new Intent();
intents.setAction("android.intent.action.VIEW");
intents.addCategory("android.intent.category.DEFAULT");
intents.setData(uri);
intents.setDataAndType(Uri.fromFile(file),"application/vnd.android.package-archive");
intents.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intents);
但是6.0之后这样写部分手机会调不起来这个intent,是因为文件的uri地址不对。 7.0之后文件共享需要使用FileProvider的功能，uri的获取又不一样了。
因此，为了兼容这个问题，下面就给出正确的解决办法。
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>
<service android:name=".DownLoadService"/>
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
</paths>
import android.app.DownloadManager;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.IBinder;
import android.provider.MediaStore;
import android.support.v4.content.FileProvider;
import android.webkit.MimeTypeMap;
import android.widget.Toast;
import java.io.File;
/**
* 更新APP
*/
public class DownLoadService extends Service {
private DownloadManager manager;
private DownloadCompleteReceiver receiver;
private String url;
private String DOWNLOADPATH = "/demo/apk/";
private void initDownManager() {
manager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
receiver = new DownloadCompleteReceiver();
DownloadManager.Request down = new DownloadManager.Request(Uri.parse(url));
down.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE
| DownloadManager.Request.NETWORK_WIFI);
down.setAllowedOverRoaming(false);
MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(url));
down.setMimeType(mimeString);
down.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
down.setVisibleInDownloadsUi(true);
down.setDestinationInExternalPublicDir(DOWNLOADPATH,"demo.apk");
down.setTitle("demo");
manager.enqueue(down);
registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
url = intent.getStringExtra("downloadurl");
String path = Environment.getExternalStorageDirectory().getAbsolutePath()+ DOWNLOADPATH + "demo.apk";
File file = new File(path);
if(file.exists()){
deleteFileWithPath(path);
}
try{
initDownManager();
}catch (Exception e){
e.printStackTrace();
try {
Uri uri = Uri.parse("market://details?id=" + getPackageName());
Intent intent0 = new Intent(Intent.ACTION_VIEW, uri);
intent0.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent0);
} catch (Exception ex) {
Toast.makeText(getApplicationContext(),"下载失败",Toast.LENGTH_SHORT).show();
}
}
return Service.START_NOT_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onDestroy() {
if (receiver != null)
unregisterReceiver(receiver);
super.onDestroy();
}
class DownloadCompleteReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
long downId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
if(manager.getUriForDownloadedFile(downId)!=null){
installAPK(context,getRealFilePath(context,manager.getUriForDownloadedFile(downId)));
}else{
Toast.makeText(context,"下载失败",Toast.LENGTH_SHORT).show();
}
DownLoadService.this.stopSelf();
}
}
private void installAPK(Context context,String path) {
File file = new File(path);
if(file.exists()){
openFile(file,context);
}else{
Toast.makeText(context,"下载失败",Toast.LENGTH_SHORT).show();
}
}
}
public String getRealFilePath(Context context, Uri uri) {
if (null == uri) return null;
final String scheme = uri.getScheme();
String data = null;
if (scheme == null)
data = uri.getPath();
else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
data = uri.getPath();
} else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.ImageColumns.DATA}, null, null, null);
if (null != cursor) {
if (cursor.moveToFirst()) {
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
if (index > -1) {
data = cursor.getString(index);
}
}
cursor.close();
}
}
return data;
}
/**
*重点在这里
*/
public void openFile(File var0, Context var1) {
Intent var2 = new Intent();
var2.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
var2.setAction(Intent.ACTION_VIEW);
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.N){
Uri uriForFile = FileProvider.getUriForFile(var1, var1.getApplicationContext().getPackageName() + ".provider", var0);
var2.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
var2.setDataAndType(uriForFile, var1.getContentResolver().getType(uriForFile));
}else{
var2.setDataAndType(Uri.fromFile(var0), getMIMEType(var0));
}
try {
var1.startActivity(var2);
} catch (Exception var5) {
var5.printStackTrace();
Toast.makeText(var1, "没有找到打开此类文件的程序", Toast.LENGTH_SHORT).show();
}
}
public String getMIMEType(File var0) {
String var1 = "";
String var2 = var0.getName();
String var3 = var2.substring(var2.lastIndexOf(".") + 1, var2.length()).toLowerCase();
var1 = MimeTypeMap.getSingleton().getMimeTypeFromExtension(var3);
return var1;
}
public static boolean deleteFileWithPath(String filePath) {
SecurityManager checker = new SecurityManager();
File f = new File(filePath);
checker.checkDelete(filePath);
if (f.isFile()) {
f.delete();
return true;
}
return false;
}
}
在MainActivity中获取点击下载的按钮，我们来开启下载任务。
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="xiangshang.xiangshang.com.demo.MainActivity">
<Button
android:id="@+id/btDownload"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="点击下载"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
import android.Manifest;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
import com.tbruyelle.rxpermissions.RxPermissions;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.btDownload).setOnClickListener(v->{
RxPermissions.getInstance(MainActivity.this).request(Manifest.permission.WRITE_EXTERNAL_STORAGE).subscribe(granted -> {
if (granted) {
Intent service = new Intent(MainActivity.this, DownLoadService.class);
service.putExtra("downloadurl", "http://www.51yi.org/app/Volunteer.apk");
Toast.makeText(MainActivity.this,"正在下载中",Toast.LENGTH_SHORT).show();
startService(service);
} else {
Toast.makeText(MainActivity.this,"SD卡下载权限被拒绝",Toast.LENGTH_SHORT).show();
}
});
});
}
}
这里用到了RxPermissions和Lambda表达式，需要在gradle里配置一下。
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "xiangshang.xiangshang.com.demo"
minSdkVersion 15
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
jackOptions{
enabled true
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.2.0'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
compile 'com.jakewharton.rxbinding:rxbinding:0.4.0'
compile 'com.tbruyelle.rxpermissions:rxpermissions:0.8.0@aar'
}
重点在openFile(File var0, Context var1)这个方法中哦。
好了，以上就是Demo的全部代码，我就不传Demo了，经过测试，完美适配6.0，7.0等系统。