<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

public class MainActivity extends AppCompatActivity {

    private MyBroadcaseReceiver receiver;
    private String path = "http://img4q.duitang.com/uploads/item/201411/23/20141123072535_28aMM" 
 
+
            ".jpeg";
@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
x.view().inject(this);
//動態註冊廣播
IntentFilter filter = new IntentFilter();
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
 
receiver = new MyBroadcaseReceiver();
        this.registerReceiver(receiver, filter);
}

    private void getData(String path) {
        RequestParams params = new RequestParams(path);
//設定下載路勁
params.setSaveFilePath(Environment.getExternalStorageDirectory().getAbsolutePath() +
                "/wangluo"
 
);
//設定斷點續傳記得和 params.setAutoRename(true);區分
params.setAutoResume(true);
//設定執行緒池的個數,預設好像是5個
params.setExecutor(new PriorityExecutor(3, true));
//get請求資料
x.http().get(params, new Callback.ProgressCallback<File>() {
            @Override
public void onSuccess(File result) {
                Toast.makeText(MainActivity.this, "下載成功onSuccess()", Toast.LENGTH_SHORT).show();
}
            @Override
public void onError(Throwable ex, boolean isOnCallback) {

            }
            @Override
public void onCancelled(CancelledException cex) {

            }
            @Override
public void onFinished() {
                Toast.makeText(MainActivity.this, "下載完成onFinished()", Toast.LENGTH_SHORT).show();
}
            @Override
public void onWaiting() {

            }
            @Override
public void onStarted() {

            }
            @Override
public void onLoading(long total, long current, boolean isDownloading) {
                Toast.makeText(MainActivity.this, "下載進度onLoading()" + (current / total * 100) +
                        "%", Toast.LENGTH_SHORT).show();
}
        });
}

    class MyBroadcaseReceiver extends BroadcastReceiver {

        @Override
public void onReceive(Context context, Intent intent) {
//            判斷當前傳過來的Action是否是哪裡的斷網Actiion
if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
                ConnectivityManager manager = (ConnectivityManager) getSystemService(Context
                        .CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
//判斷有網路或無網路
if (info != null && info.isConnected()) {
                    //如果有網,判斷當前是否是WIFI或移動資料或者其他第三方網路(VPN等)
if (ConnectivityManager.TYPE_WIFI == info.getType()) {
                        Toast.makeText(context, "WIFI已連結,可以下載資料", Toast.LENGTH_SHORT).show();
//如果是WIFI狀態下載檔案
getData(path);
} else if (ConnectivityManager.TYPE_MOBILE == info.getType()) {
                        Toast.makeText(context, "當前使用的是移動資料,請謹慎使用", Toast.LENGTH_SHORT).show();
} else {
                        Toast.makeText(context, "連結的第三方網路,請謹慎使用", Toast.LENGTH_SHORT).show();
}
                } else {//如果沒有網路彈出吐司,也可以彈出對話方塊
Toast.makeText(context, "當前沒有網路,請連結網路", Toast.LENGTH_SHORT).show();
}
            }
        }
    }

    //登出廣播
@Override
protected void onDestroy() {
        super.onDestroy();
unregisterReceiver(receiver);
}
}