Aria/app/src/main/java/com/example/arial/downloaddemo/MainActivity.java

package com.example.arial.downloaddemo;

import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.arialyy.downloadutil.util.DownLoadUtil;
import com.arialyy.downloadutil.util.Util;

import java.net.HttpURLConnection;

public class MainActivity extends AppCompatActivity {
  private static final int DOWNLOAD_PRE = 0x01;
  private static final int DOWNLOAD_STOP = 0x02;
  private static final int DOWNLOAD_FAILE = 0x03;
  private static final int DOWNLOAD_CANCEL = 0x04;
  private static final int DOWNLOAD_RESUME = 0x05;
  private static final int DOWNLOAD_COMPLETE = 0x06;
  private ProgressBar mPb;
  private String mDownloadUrl =
      "http://static.gaoshouyou.com/d/12/0d/7f120f50c80d2e7b8c4ba24ece4f9cdd.apk";
  private DownLoadUtil mUtil;
  private Button mStart, mStop, mCancel;
  private TextView mSize;

  private Handler mUpdateHandler = new Handler() {
    @Override public void handleMessage(Message msg) {
      super.handleMessage(msg);
      switch (msg.what) {
        case DOWNLOAD_PRE:
          mSize.setText(Util.formatFileSize((Long) msg.obj));
          mStart.setEnabled(false);
          break;
        case DOWNLOAD_FAILE:
          Toast.makeText(MainActivity.this, "下载失败", Toast.LENGTH_SHORT).show();
          break;
        case DOWNLOAD_STOP:
          Toast.makeText(MainActivity.this, "暂停下载", Toast.LENGTH_SHORT).show();
          mStart.setText("恢复");
          mStart.setEnabled(true);
          break;
        case DOWNLOAD_CANCEL:
          mPb.setProgress(0);
          Toast.makeText(MainActivity.this, "取消下载", Toast.LENGTH_SHORT).show();
          mStart.setEnabled(true);
          mStart.setText("开始");
          break;
        case DOWNLOAD_RESUME:
          Toast.makeText(MainActivity.this, "恢复下载，恢复位置 ==> " + Util.formatFileSize((Long) msg.obj),
              Toast.LENGTH_SHORT).show();
          mStart.setEnabled(false);
          break;
        case DOWNLOAD_COMPLETE:
          Toast.makeText(MainActivity.this, "下载完成", Toast.LENGTH_SHORT).show();
          mStart.setEnabled(true);
          mCancel.setEnabled(false);
          mStop.setEnabled(false);
          break;
      }
    }
  };

  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    init();
  }

  private void init() {
    mPb = (ProgressBar) findViewById(R.id.progressBar);
    mStart = (Button) findViewById(R.id.start);
    mStop = (Button) findViewById(R.id.stop);
    mCancel = (Button) findViewById(R.id.cancel);
    mSize = (TextView) findViewById(R.id.size);
    mUtil = new DownLoadUtil();
  }

  public void onClick(View view) {
    switch (view.getId()) {
      case R.id.start:
        start();
        break;
      case R.id.stop:
        stop();
        break;
      case R.id.cancel:
        cancel();
        break;
    }
  }

  private void start() {
    mUtil.download(this, mDownloadUrl,
        Environment.getExternalStorageDirectory().getPath() + "/test.apk",
        new DownLoadUtil.DownloadListener() {
          long fileSize = 1;

          @Override public void onPreDownload(HttpURLConnection connection) {
            super.onPreDownload(connection);
            mPb.setMax(100);
            fileSize = connection.getContentLength();
            mUpdateHandler.obtainMessage(DOWNLOAD_PRE, fileSize).sendToTarget();
          }

          @Override public void onStart(long startLocation) {
            super.onStart(startLocation);
          }

          @Override public void onChildResume(long resumeLocation) {
            super.onChildResume(resumeLocation);
          }

          @Override public void onChildComplete(long finishLocation) {
            super.onChildComplete(finishLocation);
          }

          @Override public void onProgress(long currentLocation) {
            super.onProgress(currentLocation);
            mPb.setProgress((int) (currentLocation * 100 / fileSize));
          }

          @Override public void onStop(long stopLocation) {
            super.onStop(stopLocation);
            mUpdateHandler.obtainMessage(DOWNLOAD_STOP).sendToTarget();
          }

          @Override public void onCancel() {
            super.onCancel();
            mUpdateHandler.obtainMessage(DOWNLOAD_CANCEL).sendToTarget();
          }

          @Override public void onResume(long resumeLocation) {
            super.onResume(resumeLocation);
            mUpdateHandler.obtainMessage(DOWNLOAD_RESUME, resumeLocation).sendToTarget();
          }

          @Override public void onFail() {
            super.onFail();
            mUpdateHandler.obtainMessage(DOWNLOAD_FAILE).sendToTarget();
          }

          @Override public void onComplete() {
            super.onComplete();
            mUpdateHandler.obtainMessage(DOWNLOAD_COMPLETE).sendToTarget();
          }
        });
  }

  private void stop() {
    mUtil.stopDownload();
  }

  private void cancel() {
    mUtil.cancelDownload();
  }
}