android下载图片和视频到本地，求代码，求案例

下圆盯面是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())

             槐尘               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)

           橘明和             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()

    }

}

例子代码太长，只能给你一部分，如果想看完整例子代码，请去360手机助手下载安卓学习手册，点击里面的源码可以查看完成代码，方面快速，里面还有安卓的其它小例子，共108个。

android源码目录下的build/envsetup.sh文件，描述编译的命令

-

m:

makes

from

the

top

of

the

tree.

-

mm:

builds

all

of

the

modules

in

the

current

directory.

-

mmm:

builds

all

of

the

modules

in

the

supplied

directories.

要想使用这些命令，首先需要在android源举租码根目录执行.

build/envsetup.sh

脚本设置环境

m：编译所有的模块

mm：编译当前目录下的模块，当前目录下要有android.mk文件

mmm：编译指定路径下的模块，指定路径下要有android.mk文件

下面举个例子说明，假设我要编译android下的\hardware\libhardware_legacy\power模块，当前目录为源码根目录，方法如下：

1、.

build/envsetup.sh

2、mmm

hardware/libhardware_legacy/power/

编译完后

运行

make

snod

会重毁答腊新将纤滑你改过的模块打入到system.img中

SDK目录下就有很多啊,几乎包含了所有方吵雹面的例子.

我用的2.1版SDK,例子就仿碰宽在samples\android-7下面,android-7就是2.1版的.

如果你用的其它版本就找到对应版本备亮就行了.

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