public class MainActivity extends AppCompatActivity implements View.OnClickListener {
protected Button butLoading;
protected Button butDisplay;
protected ImageView ima;
private URL murl;
Handler handler;
private static final String MIMG = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1499753534636&di=2599426532d38becb0406764cf463f0f&imgtype=0&src=http://dynamic-image.yesky.com/1080x-/uploadImages/2015/290/49/9ORK4DGNMWC7.jpg";
private HttpImgThread httpImgThread;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.activity_main);
//主线程收到通知更新UI
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if(msg.what==1){
ima.setImageBitmap((Bitmap) msg.obj);
}
}
};
initView();
}
//点击下载并显示图片
@Override
public void onClick(View view) {
if (view.getId() == R.id.but_loading) {
imaLoading();
}
}
private void initView() {
butLoading = (Button) findViewById(R.id.but_loading);
butLoading.setOnClickListener(MainActivity.this);
butDisplay = (Button) findViewById(R.id.but_display);
butDisplay.setOnClickListener(MainActivity.this);
ima = (ImageView) findViewById(R.id.ima);
}
//下载图片
private void imaLoading() {
new Thread(new Runnable() {
@Override
public void run() {
URL url = null;
HttpURLConnection con = null;
try {
// 构造URL
url = new URL(MIMG);
// 打开连接
con = (HttpURLConnection) url.openConnection();
//请求方式
con.setRequestMethod("GET");
//设置超时时间
con.setReadTimeout(5000);
// 设置是否从httpUrlConnection读入，默认情况下是true（可以不写）;
con.setDoInput(true);
//InputStream in = con.getInputStream();
//存放路劲
String parent = Environment.getExternalStorageDirectory()+"/yu/";
File file1 = new File(parent);
//不存在创建
if(!file1.exists()){
file1.mkdir();
}
File file = new File(file1, String.valueOf(System.currentTimeMillis()));
// 输出的文件流
FileOutputStream fos = new FileOutputStream(file);
// 输入流
InputStream in = con.getInputStream();
// 2K的数据缓冲
byte ch[] = new byte[2 * 1024];
// 读取到的数据长度
int len;
if (fos != null) {
// 开始读取
while ((len = in.read(ch)) != -1) {
fos.write(ch, 0, len);
}
// 完毕，关闭所有链接
in.close();
fos.close();
}
//根据本地绝对路径获取文件file.getAbsolutePath()
final Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
//通知主线程更新UI
Message obtain = Message.obtain();
obtain.obj=bitmap;
obtain.what=1;
handler.sendMessage(obtain);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
}
