在我的MainActivity中,我需要知道一个布尔型变量的状态以隐藏或放置图标可见,但是此变量是在另一个名为TcpClient的类中生成的,该类被MainActivity多次调用,我试图使用意图从TcpClient类发送此变量,但是我有错误。
这是我的MainActivity代码:
public class MainActivity extends AppCompatActivity implements
NavigationView.OnNavigationItemSelectedListener {
private TcpClient mTcpClient;
public boolean statusWIFI = false;
.
.
public class ConnectTask extends AsyncTask<String, String, TcpClient> {
@Override
protected TcpClient doInBackground(String... message) {
mTcpClient = new TcpClient(new TcpClient.OnMessageReceived() {
@Override
//here the messageReceived method is implemented
public void messageReceived(String message) { //we create a TCPClient object and
publishProgress(message); //this method calls the onProgressUpdate
}
});
mTcpClient.run();
return null;
}
@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
//arrayList.add("RX: " + values[0]); //in the
arrayList we add the messaged received from server
mDumpTextView.append( values[0] );
mDumpTextView.append( "\n" );
mScrollView.smoothScrollTo( 0, mDumpTextView.getBottom() );
mAdapter.notifyDataSetChanged(); // notify the
adapter that the data set has changed. This means that new message
received
// from server was added to the list
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem IconWIFI = menu.findItem(R.id.bt1_wifi);
Intent intent = getIntent();
Bundle bundle = null;
bundle = getIntent().getExtras();
if (bundle !=null) {
statusWIFI = bundle.getBoolean( "mstatusWIFI");
}
if (statusWIFI == true){
IconUsbON.setVisible(true);
}else{
IconUsbON.setVisible(false);
}
return true;
}
这是我的TcpClient类的代码:
public class TcpClient {
private Boolean statusWIFIX = false;
.
.
public void stopClient() {
statusWIFIX = false;
Intent intent = new Intent( this, MainActivity.class );
intent.putExtra( "mstatusWIFI", statusWIFIX );
startActivityForResult( intent, 0 );
sendMessage(Constants.CLOSED_CONNECTION+": " + Modelox);
// send message that we are closing the connection
mRun = false;
if (mBufferOut != null) {
mBufferOut.flush();
mBufferOut.close();
}
mMessageListener = null;
mBufferIn = null;
mBufferOut = null;
mServerMessage = null;
}
这是错误;有人可以告诉我该如何纠正
答案 0 :(得分:0)
您必须必须将活动上下文传递给Intent构造函数。 TCPClient似乎没有任何活动或服务。
答案 1 :(得分:0)
我没有看到mTcpClient
的任何初始化,您需要像这样初始化它:
mTcpClient= TcpClient();
,如果您的变量在TcpClient类中,则可以通过mTcpClient.statusWIFIX
您还需要像这样将statusWIFIX范围公开:
public Boolean statusWIFIX = false;
在您的TcpClient
班上。
您还可以通过意图发送数据,但是仅用于访问状态WIFIX以再次启动活动不是一个好方法。