下载

来源：互联网发布：java安装失败1335 编辑：程序博客网时间：2024/04/30 04:51

1.xutils依赖

compile 'org.xutils:xutils:3.3.36'

2.布局：button按钮

<Button    android:id="@+id/bt_download"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_below="@+id/bt_upload"    android:text="下载"/>

3.代码

NetWorkUtils 工具类：

public class NetWorkUtils {    //判断网络状态    public static boolean isNetWorkIsAvailable(Context context){        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo info = connectivityManager.getActiveNetworkInfo();        if (info != null){            return true;        }else{            return false;        }    }    //判断wifi    public static boolean isWifi(Context context){        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo info = connectivityManager.getActiveNetworkInfo();        if (info != null && info.getType() == connectivityManager.TYPE_WIFI){            return true;        }else{            return false;        }    }    //判断流量    public static boolean isMobile(Context context){        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo info = connectivityManager.getActiveNetworkInfo();        if (info!=null&&info.getType() ==connectivityManager.TYPE_MOBILE){            return true;        }else{            return false;        }    }}

xutils appliction

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

记得要在清单文件注册

AndroidManifest.xml

android:name=".app.MyApp"

mainactivity

package com.bawei.jiangjun.activity;import android.content.DialogInterface;import android.content.Intent;import android.net.Uri;import android.os.Environment;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.Button;import android.widget.ListView;import android.widget.Toast;import com.bawei.jiangjun.R;import com.bawei.jiangjun.base.Base;import com.bawei.jiangjun.bean.Bean;import com.bawei.jiangjun.utils.NetWorkUtils;import com.google.gson.Gson;import org.xutils.common.Callback;import org.xutils.http.RequestParams;import org.xutils.x;import java.io.File;import java.util.List;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private Button xiazai;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        xiazai = (Button) findViewById(R.id.xiazai);        xiazai.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.xiazai:                boolean workIsAvailable = NetWorkUtils.isNetWorkIsAvailable(MainActivity.this);                if (!workIsAvailable) {                    Toast.makeText(MainActivity.this, "网络未连接，请设置网络", Toast.LENGTH_SHORT).show();                    Intent intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);                    startActivity(intent);                } else {                    //连接成功下载                    Toast.makeText(MainActivity.this, "网络连接成功", Toast.LENGTH_SHORT).show();                    download();                }                break;        }    }    //下载    private void download() {        final String[] items = {"wifi", "手机流量"};        new AlertDialog.Builder(this).setTitle("网络选择").setIcon(R.mipmap.ic_launcher).setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                switch (which) {                    case 0:                        //wifi下 下载apk                        downloadApk();                        break;                    case 1:                        //手机流量下提醒用户                        boolean mobile = NetWorkUtils.isMobile(MainActivity.this);                        if (mobile) {                            Toast.makeText(MainActivity.this, "现在未使用wifi,将耗用手机流量", Toast.LENGTH_SHORT).show();                            Intent wifiSettingsIntent = new Intent("android.settings.WIFI_SETTINGS");                            startActivity(wifiSettingsIntent);                        }                        dialog.dismiss();                        break;                }                dialog.dismiss();            }        }).show();    }    //下载apk    private void downloadApk() {        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle("版本更新");        builder.setMessage("现在检测到新版本，是否更新？");        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                updateApk();            }        });        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                dialog.dismiss();            }        });        builder.show();    }    //版本更新    private void updateApk() {        String url = "http://mapp.qzone.qq.com/cgi-bin/mapp/mapp_subcatelist_qq?yyb_cateid=-10&categoryName=%E8%85%BE%E8%AE%AF%E8%BD%AF%E4%BB%B6&pageNo=1&pageSize=20&type=app&platform=touch&network_type=unknown&resolution=412x732";        RequestParams params =new RequestParams(url);        params.setCacheMaxAge(1000 * 60 * 10);        x.http().get(params, new Callback.CacheCallback<String>() {            private String result = null;            @Override            public boolean onCache(String result) {                this.result = result;                Toast.makeText(MainActivity.this,"走缓存",Toast.LENGTH_SHORT).show();                //默认false不走缓存 true 走缓存 过期之后就不走缓存                getGson(result);                return true;            }            @Override            public void onSuccess(String result) {                if (result != null) {                    this.result = result;                    Toast.makeText(MainActivity.this,"调用",Toast.LENGTH_SHORT).show();                    getGson(result);                }            }            @Override            public void onError(Throwable ex, boolean isOnCallback) {            }            @Override            public void onCancelled(CancelledException cex) {            }            @Override            public void onFinished() {            }        });    }    private void getGson(String result) {        String substring = result.substring(0, result.length() - 1);        Gson gson=new Gson();        Bean bean = gson.fromJson(substring, Bean.class);        final List<Bean.AppBean> app = bean.getApp();        final AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle("点击下载");        View view=View.inflate(this,R.layout.listview,null);        ListView listView = (ListView) view.findViewById(R.id.list);        listView.setAdapter(new Base(this,app));        builder.setView(view);        builder.setNegativeButton("后台下载", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                dialog.dismiss();            }        });        builder.show();        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                RequestParams params = new RequestParams(app.get(position).getUrl());                String s = Environment.getExternalStorageDirectory() + "/bawei/";                File file=new File(s);                if (!file.exists()){                    file.mkdir();                }                //保存到sdcard                params.setSaveFilePath(Environment.getExternalStorageDirectory() + "/bawei/");                //自动文件命令                params.setAutoRename(true);                //下载                x.http().post(params, new Callback.ProgressCallback<File>() {                    @Override                    public void onWaiting() {                    }                    @Override                    public void onStarted() {                    }                    @Override                    public void onLoading(long total, long current, boolean isDownloading) {                    }                    @Override                    public void onSuccess(File result) {                        Intent intent = new Intent(Intent.ACTION_VIEW);                        intent.setDataAndType(Uri.fromFile(result), "application/vnd.android.package-archive");                        startActivity(intent);                    }                    @Override                    public void onError(Throwable ex, boolean isOnCallback) {                    }                    @Override                    public void onCancelled(CancelledException cex) {                        Toast.makeText(MainActivity.this,"取消",Toast.LENGTH_SHORT).show();                    }                    @Override                    public void onFinished() {                    }                });                Toast.makeText(MainActivity.this,"正在下载请稍后......",Toast.LENGTH_SHORT).show();            }        });    }}

0 0