android xutils3 Android基于开源项目xutils3实现下载
龙谷情Sinoam 人气:0上一次自己写了一个多线程断点续传下载的demo，过于麻烦，bug超多，所以我学习使用xutils来完成此功能。
先将xutils依赖搭建好（上一篇博客已经具体写了方法）
先看看效果图：
下面开始代码的逻辑：
在xutils3以前使用HttpUtils新建对象即可使用，3以后取消了HttpUtils，具体方法请看代码。
首先创建布局activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<EditText
android:id="@+id/et_path"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入下载路径"
android:text="http://10.173.29.234/gp.apk" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下载"
android:onClick="click"/>
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
然后MainActivity.java:
import android.app.Activity;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
import org.xutils.common.Callback;
import org.xutils.http.RequestParams;
import org.xutils.x;
import java.io.File;
public class MainActivity extends AppCompatActivity {
private EditText et_path;
private ProgressBar pb;
//动态获取权限
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
"android.permission.READ_EXTERNAL_STORAGE",
"android.permission.WRITE_EXTERNAL_STORAGE" };
private String fileName;
private String appName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//动态获取权限
verifyStoragePermissions(this);
x.view().inject(this);
et_path = findViewById(R.id.et_path);
pb = findViewById(R.id.progressBar);
}
//点击按钮下载（断点续传）
public void click(View view) {
//拿到路径
String path = et_path.getText().toString().trim();
fileName = getFileName(path);
RequestParams params = new RequestParams(path);
params.setSaveFilePath(fileName);
params.setAutoRename(true);
x.http().get(params, new Callback.ProgressCallback<File>() {
@Override
public void onWaiting() {
}
@Override
public void onStarted() {
}
@Override
public void onLoading(long total, long current, boolean isDownloading) {
//totle代表总进度，current代表当前进度
pb.setMax((int) total);
pb.setProgress((int) current);
System.out.println("测试1");
}
@Override
public void onSuccess(File result) {
System.out.println("下载完成");
Toast.makeText(getApplicationContext(), "下载成功", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(Throwable ex, boolean isOnCallback) {
System.out.println("测试2");
}
@Override
public void onCancelled(CancelledException cex) {
System.out.println("测试3");
}
@Override
public void onFinished() {
System.out.println("测试4");
}
});
}
//动态获取权限
public static void verifyStoragePermissions(Activity activity) {
try {
//检测是否有写的权限
int permission = ActivityCompat.checkSelfPermission(activity,
"android.permission.WRITE_EXTERNAL_STORAGE");
if (permission != PackageManager.PERMISSION_GRANTED) {
// 没有写的权限，去申请写的权限，会弹出对话框
ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE);
}
} catch (Exception e) {
e.printStackTrace();
}
}
//获取文件名-->"http://10.173.29.234/test.exe"
public String getFileName(String path) {
int start = path.lastIndexOf("/") + 1;
appName = path.substring(start);
// String fileName = Environment.getExternalStorageDirectory().getPath()+"/"+subString;
String fileName = "/sdcard/file/"+ appName;
return fileName;
}
}
第53行注意x.http().get(params, new Callback.ProgressCallback<File>(){}；<>中要写File，因为下载的是一个文件，否则文件不会下载下来。
还要加上权限：
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
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