xUtils 下载apk , 实现断点续传

添加Button点击按钮，点击按钮开始使用xUtils的网络模块进行apk安装包的下载，支持随时停止下载任务，成功后使用Dialog询问用户是否安装，并安装。

数据接口：

http://softfile.3g.qq.com:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk

代码实现:

导入xUtils 的依赖或jar包

MyApp.java

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

在清单文件中引入, 并且添加 网络权限和sd卡的读写权限

<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"/><application    android:name=".demo01.MyApp"

页面:

<?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="bw.com.bw_test.demo01.DownLoadApkActivity">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="下载"        android:id="@+id/but_id"        />    <ProgressBar        android:layout_width="match_parent"        android:layout_height="5dp"        android:id="@+id/progress_bar_id"        android:layout_marginTop="30dp"        style="?android:attr/progressBarStyleHorizontal"        /></LinearLayout>

代码:

@ContentView(value = R.layout.activity_down_load_apk)public class DownLoadApkActivity extends AppCompatActivity {    @ViewInject(value = R.id.but_id)    private Button button;    @ViewInject(value = R.id.progress_bar_id)    private ProgressBar pb;    private Callback.Cancelable cancelable;    private boolean isDownLoading = true;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        x.view().inject(this);    }    @Event(value = {R.id.but_id})    private void onClick(View view)    {        if (isDownLoading==true)        {            button.setText("暂停");            RequestParams params = new RequestParams("http://softfile.3g.qq.com:8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk");            params.setAutoResume(true);            params.setSaveFilePath(getExternalCacheDir()+ File.separator+"abc.apk");            cancelable =   x.http().get(params, new Callback.ProgressCallback<File>() {                @Override                public void onLoading(long total, long current, boolean isDownLoading) {                    pb.setProgress((int)(current*100/total));                }                @Override                public void onSuccess(final File file) {                    AlertDialog.Builder builder = new AlertDialog.Builder(DownLoadApkActivity.this);                    builder.setIcon(R.mipmap.ic_launcher);                    builder.setTitle("提示");                    builder.setMessage("是否立即安装?");                    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {                        @Override                        public void onClick(DialogInterface dialog, int which) {                            Intent intent = new Intent();                            intent.setAction(Intent.ACTION_VIEW);                            intent.setDataAndType(Uri.fromFile(file),"application/vnd.android.package-archive");                            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                            DownLoadApkActivity.this.startActivity(intent);                        }                    });                    builder.setNegativeButton("取消",null);                    builder.show();                }                @Override                public void onError(Throwable throwable, boolean b) {                }                @Override                public void onCancelled(CancelledException e) {                }                @Override                public void onFinished() {                }                @Override                public void onWaiting() {                }                @Override                public void onStarted() {                }            });        }else        {            button.setText("下载");            cancelable.cancel();        }        isDownLoading = !isDownLoading;    }}