主程序
package com.example.myhttpdcc;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.SeekBar;
import androidx.appcompat.app.AppCompatActivity;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
public class MainActivity extends AppCompatActivity {
private SeekBar mSeekBar;
private final String urlString = "http://192.168.43.8:280/AA.jpg";
private ImageView mIV;
private int fileLength;
private Bitmap mBitmap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSeekBar = (SeekBar)findViewById(R.id.seekbar);
mIV = (ImageView)findViewById(R.id.image);
new Thread(downloadRunn).start();
}
private Runnable downloadRunn = new Runnable(){
@Override
public void run() {
try {
URL url = new URL(urlString);
URLConnection connection = url.openConnection();
connection.connect();
fileLength = connection.getContentLength();
InputStream in = new BufferedInputStream(connection.getInputStream());
byte[] arr = readStream(in);
mBitmap = BitmapFactory.decodeByteArray(arr,0,arr.length);
connectHanlder.sendEmptyMessage(0);
} catch (Exception e) {
e.printStackTrace();
}
}
};
public byte[] readStream(InputStream in) throws Exception{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte data[] = new byte[1024];
long total = 0;
int count;
while((count = in.read(data))!=-1){
total+=count;
mSeekBar.setProgress((int)(total*100)/fileLength);
bos.write(data,0,count);
}
bos.close();
in.close();
return bos.toByteArray();
}
private Handler connectHanlder = new Handler() {
@Override
public void handleMessage(Message msg) {
// 更新UI,顯示圖片
if (mBitmap != null) {
mIV.setImageBitmap(mBitmap);// display image
}
}
};
}
佈局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<SeekBar
android:id="@+id/seekbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:progress="50"/>
<ImageView
android:id="@+id/image"
android:layout_width="match_parent"
android:layout_height="150dp"
android:scaleType="center"/>
</LinearLayout>
添加權限
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myhttpdcc">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Android studio 37 下載網絡圖片 並顯示
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