android下载图片和视频到本地,求代码,求案例

发布网友发布时间：2022-07-23 10:28

共1个回答

热心网友时间：2023-11-30 11:13

下面是android多线程下载例子截图：

package mm.shandong.com.testmultithreaddownload;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.io.File;
import mm.shandong.com.testmultithreaddownload.thread.UpdateUIThread;
import mm.shandong.com.testmultithreaddownload.util.FileUtil;
public class TestMultiThreadDownLoadActivity extends AppCompatActivity {
    ProgressDialog pb;
    EditText editText;
    Handler handler;
    private UpdateUIThread mUpdateUIThread = null;
    ///文件路径
    private String url =
            "http://gdown.baidu.com/data/wisegame/3c00add7144d3915/kugouyinle.apk";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_multi_thread_down_load);
        editText = (EditText) findViewById(R.id.editText);
        initHandler();
    }
    public void initHandler() {
        handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case FileUtil.startDownloadMeg:
                        pb.setMax(mUpdateUIThread.getFileSize());   //开始
                        break;
                    case FileUtil.updateDownloadMeg:
                        if (!mUpdateUIThread.isCompleted())   //下载进度消息
                        {
                            pb.setProgress(mUpdateUIThread.getDownloadSize());
                            pb.setMessage("下载速度：" +
                               mUpdateUIThread.getDownloadSpeed() + "k/秒    " +
                               "   下载百分比" + mUpdateUIThread.getDownloadPercent() + "%");
                        } else {
                            pb.setMessage("下载完成");
                        }
                        break;
                    case FileUtil.endDownloadMeg:
                        Toast.makeText(TestMultiThreadDownLoadActivity.this,
                                "下载完成,马上安装", Toast.LENGTH_SHORT).show();
                /*apk安装界面跳转*/
                        String filename = FileUtil.getFileName(url);
                        String str = "/myfile/" + filename;
                        String fileName = Environment.getExternalStorageDirectory() + str;
                        Intent intent = new Intent(Intent.ACTION_VIEW);
                        intent.setDataAndType(Uri.fromFile(new File(fileName)),
                                "application/vnd.android.package-archive");
                        startActivity(intent);
                        break;
                }
                super.handleMessage(msg);
            }
        };
    }
   ///开始下载软件
    public void startDownLoad(View view) {
        if (TextUtils.isEmpty(editText.getText().toString())) {
            Toast.makeText(this, "你输入下载文件地址", Toast.LENGTH_SHORT).show();
            return;
        } else {
            url = editText.getText().toString();
        }
        //启动线程初始化下载参数
        mUpdateUIThread = new UpdateUIThread(handler, url,
                FileUtil.setMkdir(this) + File.separator, FileUtil.getFileName(url));
        pb = new ProgressDialog(this);
        pb.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        pb.show();
        mUpdateUIThread.start();
    }
}

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