Android第5天，httpclient，多线程断点续传，进度条，xUtils

来源：互联网发布：a href js 函数编辑：程序博客网时间：2024/06/06 01:09

httpclient

使用原始的httpclient

public class MainActivity extends Activity {    Handler handler = new Handler(){        @Override        public void handleMessage(android.os.Message msg) {            Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void get(View v){        EditText et_name = (EditText) findViewById(R.id.et_name);        EditText et_pass = (EditText) findViewById(R.id.et_pass);        final String name = et_name.getText().toString();        final String pass = et_pass.getText().toString();        Thread t = new Thread(){            @Override            public void run() {                String path = "http://192.168.13.13/Web/servlet/CheckLogin?name=" + URLEncoder.encode(name) + "&pass=" + pass;                HttpClient hc = new DefaultHttpClient();                HttpGet hg = new HttpGet(path);                try {                    HttpResponse hr = hc.execute(hg);                    StatusLine sl = hr.getStatusLine();                    if(sl.getStatusCode() == 200){                        HttpEntity he = hr.getEntity();                        InputStream is = he.getContent();                        String text = Utils.getTextFromStream(is);                        Message msg = handler.obtainMessage();                        msg.obj = text;                        handler.sendMessage(msg);                    }                } catch (Exception e) {                    e.printStackTrace();                }            }        };        t.start();    }    public void post(View v){        EditText et_name = (EditText) findViewById(R.id.et_name);        EditText et_pass = (EditText) findViewById(R.id.et_pass);        final String name = et_name.getText().toString();        final String pass = et_pass.getText().toString();        Thread t = new Thread(){            @Override            public void run() {                String path = "http://192.168.13.13/Web/servlet/CheckLogin";                HttpClient hc = new DefaultHttpClient();                HttpPost hp = new HttpPost(path);                BasicNameValuePair bnvp = new BasicNameValuePair("name", name);                BasicNameValuePair bnvp2 = new BasicNameValuePair("pass", pass);                List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();                parameters.add(bnvp);                parameters.add(bnvp2);                try {                    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, "utf-8");                    hp.setEntity(entity);                    HttpResponse hr = hc.execute(hp);                    if(hr.getStatusLine().getStatusCode() == 200){                        InputStream is = hr.getEntity().getContent();                        String text = Utils.getTextFromStream(is);                        Message msg = handler.obtainMessage();                        msg.obj = text;                        handler.sendMessage(msg);                    }                } catch (Exception e) {                    e.printStackTrace();                }            }        };        t.start();    }}

使用封装好的AsyncHttpClient，从github上面下载这个库

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void get(View v){        EditText et_name = (EditText) findViewById(R.id.et_name);        EditText et_pass = (EditText) findViewById(R.id.et_pass);        final String name = et_name.getText().toString();        final String pass = et_pass.getText().toString();        String url = "http://192.168.13.13/Web/servlet/CheckLogin?name=" + URLEncoder.encode(name) + "&pass=" + pass;        AsyncHttpClient ahc = new AsyncHttpClient();        ahc.get(url, new MyResponseHandler());    }    public void post(View v){        EditText et_name = (EditText) findViewById(R.id.et_name);        EditText et_pass = (EditText) findViewById(R.id.et_pass);        final String name = et_name.getText().toString();        final String pass = et_pass.getText().toString();        String url = "http://192.168.13.13/Web/servlet/CheckLogin";        AsyncHttpClient ahc = new AsyncHttpClient();        // 设置请求参数        RequestParams params = new RequestParams();        params.add("name", name);        params.add("pass", pass);        ahc.post(url, params, new MyResponseHandler());    }    class MyResponseHandler extends AsyncHttpResponseHandler{        @Override        public void onSuccess(int statusCode, Header[] headers,                byte[] responseBody) {            Toast.makeText(MainActivity.this, new String(responseBody), 0).show();        }        @Override        public void onFailure(int statusCode, Header[] headers,                byte[] responseBody, Throwable error) {            Toast.makeText(MainActivity.this, "请求失败", 0).show();                }    }  }

多线程断点续传下载

自己写代码实现

public class MainActivity extends Activity {    static int ThreadCount = 3;    static int finishedThread = 0;    int currentProgress;    String fileName = "QQPlayer.exe";    String path = "http://192.168.13.13:8080/" + fileName;    private ProgressBar pb;    TextView tv;    Handler handler = new Handler(){        public void handleMessage(android.os.Message msg) {            // 使用long来计算进度，防止文件过大显示出错。            tv.setText((long)pb.getProgress() * 100 / pb.getMax() + "%");        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        pb = (ProgressBar) findViewById(R.id.pb);        tv = (TextView) findViewById(R.id.tv);    }    public void click(View v){        Thread t = new Thread(){            @Override            public void run() {                try {                    URL url = new URL(path);                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();                    conn.setRequestMethod("GET");                    conn.setConnectTimeout(5000);                    conn.setReadTimeout(5000);                    if(conn.getResponseCode() == 200){                        // 获取文件的总长度                        int length = conn.getContentLength();                        pb.setMax(length);                        File file = new File(Environment.getExternalStorageDirectory(), fileName);                        // 读写，并且每次都写入磁盘的方式打开文件                        RandomAccessFile raf = new RandomAccessFile(file, "rwd");                        raf.setLength(length);                        raf.close();                        // 计算每个线程需要下载的数据的大小                        int size = length / ThreadCount;                        for (int i = 0; i < ThreadCount; i++) {                            int startIndex = i * size;                            int endIndex = (i + 1) * size - 1;                            // 当不能整除的时候，余数给最后一个线程                            if (i == ThreadCount - 1){                                endIndex = length - 1;                            }                            new DownLoadThread(startIndex, endIndex, i).start();                        }                    }                } catch (Exception e) {                    e.printStackTrace();                }            }        };        t.start();    }    class DownLoadThread extends Thread{        int startIndex;        int endIndex;        int threadId;        public DownLoadThread(int startIndex, int endIndex, int threadId) {            super();            this.startIndex = startIndex;            this.endIndex = endIndex;            this.threadId = threadId;        }        @Override        public void run() {            try {                File progressFile = new File(Environment.getExternalStorageDirectory(), threadId + ".txt");                // 保存断点的临时文件                if (progressFile.exists()) {                    FileInputStream fis = new FileInputStream(progressFile);                    BufferedReader br = new BufferedReader(new InputStreamReader(fis));                    // 读取保存的断点进度                    int lastProgress = Integer.parseInt(br.readLine());                    startIndex += lastProgress;                    // 获取新的开始位置                    currentProgress += lastProgress;                    pb.setProgress(currentProgress);                    // 更新进度条的开始位置                    handler.sendEmptyMessage(1);                    fis.close();                }                HttpURLConnection conn;                URL url = new URL(path);                conn = (HttpURLConnection) url.openConnection();                conn.setRequestMethod("GET");                conn.setConnectTimeout(5000);                conn.setReadTimeout(5000);                // 设置要下载的数据的范围                conn.setRequestProperty("Range", "bytes=" + startIndex + "-" + endIndex);                // 请求成功                if(conn.getResponseCode() == 206){                    InputStream is = conn.getInputStream();                    byte[] b = new byte[1024];                    int len = 0;                    int total = 0;                    File file = new File(Environment.getExternalStorageDirectory(), fileName);                    RandomAccessFile raf = new RandomAccessFile(file, "rwd");                    // 设置开始写入的位置                    raf.seek(startIndex);                    while((len = is.read(b)) != -1){                        raf.write(b, 0, len);                        total += len;                        // 跟新进度条                        currentProgress += len;                        pb.setProgress(currentProgress);                        //更新textview                        handler.sendEmptyMessage(1);                        // 保存总的下载值到临时文件中，给断点续传使用。                        RandomAccessFile progressRaf = new RandomAccessFile(progressFile, "rwd");                        progressRaf.write((total + "").getBytes());                        progressRaf.close();                    }                    raf.close();                    finishedThread++;                    synchronized (path) {                        if(finishedThread == ThreadCount){                            for (int i = 0; i < ThreadCount; i++) {                                File f = new File(Environment.getExternalStorageDirectory(), i + ".txt");                                f.delete();                            }                            finishedThread = 0;                        }                    }                   }            } catch (Exception e) {                e.printStackTrace();            }        }    }}

布局文件

<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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity"     android:orientation="vertical"    >    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="开始下载"         android:onClick="click"        />    <ProgressBar         android:id="@+id/pb"        android:layout_width="match_parent"        android:layout_height="wrap_content"        style="@android:style/Widget.ProgressBar.Horizontal"        />    <TextView         android:id="@+id/tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        /></LinearLayout>

使用xUtils库下载

下载xUtils库

public class MainActivity extends Activity {    private TextView tv_failure;    private TextView tv_progress;    private ProgressBar pb;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv_failure = (TextView) findViewById(R.id.tv_failure);        tv_progress = (TextView) findViewById(R.id.tv_progress);        pb = (ProgressBar) findViewById(R.id.pb);    }    public void click(View v){        HttpUtils utils = new HttpUtils();        String fileName = "QQPlayer.exe";        String path = "http://192.168.13.13:8080/" + fileName;        utils.download(path,                 "sdcard/QQPlayer.exe",                 true,                true, new RequestCallBack<File>() {                    @Override                    public void onSuccess(ResponseInfo<File> arg0) {                        Toast.makeText(MainActivity.this, arg0.result.getPath(), 0).show();                    }                    @Override                    public void onFailure(HttpException arg0, String arg1) {                        tv_failure.setText(arg1);                    }                    @Override                    public void onLoading(long total, long current,                            boolean isUploading) {                        super.onLoading(total, current, isUploading);                        pb.setMax((int)total);                        pb.setProgress((int)current);                        tv_progress.setText(current * 100 / total + "%");                    }                });    }}

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