接收并解析出帧头为0x01,0xFE帧尾为0xFE,0x01的二进制rgb565数据流宽为120高为120,直接decode成bitmap,然后生成图片 ,把图片路径广播出去 ,再首页或者二级页面监听广播并展示,不存储到sd卡
时间: 2023-12-20 11:06:50 浏览: 117
怎么拼接中间有0x00符的字符串(数组)
好的,这个功能需要涉及到一些Android的开发知识和网络通信知识。下面是大致的步骤:
1. 建立一个广播接收者类,用于接收广播并展示图片。
```java
public class ImageReceiver extends BroadcastReceiver {
private ImageView imageView;
public ImageReceiver(ImageView imageView) {
this.imageView = imageView;
}
@Override
public void onReceive(Context context, Intent intent) {
String imagePath = intent.getStringExtra("imagePath");
Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
imageView.setImageBitmap(bitmap);
}
}
```
这个广播接收者类会在收到广播时展示图片。
2. 在MainActivity或其他页面中注册广播接收者。
```java
private ImageReceiver imageReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView imageView = findViewById(R.id.imageView);
imageReceiver = new ImageReceiver(imageView);
IntentFilter filter = new IntentFilter("com.example.IMAGE_BROADCAST");
registerReceiver(imageReceiver, filter);
}
```
3. 在发送端,将二进制rgb565数据流解析为Bitmap,然后将Bitmap转换为字节数组,并通过UDP广播发送出去。
```java
// 解析二进制rgb565数据流为Bitmap
Bitmap bitmap = Bitmap.createBitmap(120, 120, Bitmap.Config.RGB_565);
byte[] data = ... // 从数据流中获取字节数组
ByteBuffer buffer = ByteBuffer.wrap(data);
ShortBuffer shortBuffer = buffer.asShortBuffer();
for (int y = 0; y < 120; y++) {
for (int x = 0; x < 120; x++) {
int r = ((shortBuffer.get() >> 11) & 0x1F) << 3;
int g = ((shortBuffer.get() >> 5) & 0x3F) << 2;
int b = (shortBuffer.get() & 0x1F) << 3;
bitmap.setPixel(x, y, Color.rgb(r, g, b));
}
}
// 将Bitmap转换为字节数组
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
// 发送UDP广播
DatagramSocket socket = new DatagramSocket();
InetAddress address = InetAddress.getByName("255.255.255.255");
DatagramPacket packet = new DatagramPacket(byteArray, byteArray.length, address, 8888);
socket.send(packet);
socket.close();
```
4. 在接收端,通过UDP监听广播,并把收到的数据解析成Bitmap,然后将Bitmap展示出来并广播出去。
```java
DatagramSocket socket = new DatagramSocket(8888);
byte[] buffer = new byte[1024];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
while (true) {
socket.receive(packet);
// 解析字节数组为Bitmap
Bitmap bitmap = BitmapFactory.decodeByteArray(packet.getData(), 0, packet.getLength());
// 在界面上展示Bitmap
ImageView imageView = findViewById(R.id.imageView);
imageView.setImageBitmap(bitmap);
// 广播图片路径
String imagePath = saveBitmap(bitmap);
Intent intent = new Intent("com.example.IMAGE_BROADCAST");
intent.putExtra("imagePath", imagePath);
sendBroadcast(intent);
}
```
5. 在saveBitmap()方法中,将Bitmap保存到应用程序私有目录下,并返回图片路径。
```java
private String saveBitmap(Bitmap bitmap) {
String fileName = "image_" + System.currentTimeMillis() + ".png";
File file = new File(getFilesDir(), fileName);
try {
FileOutputStream outputStream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
return file.getAbsolutePath();
}
```
这样就可以实现将二进制rgb565数据流解析为Bitmap并广播出去,其他页面可以监听广播并展示图片了。
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