【发布时间】：2020-03-26 13:25:39
【问题描述】：
我的代码有什么问题？它显示错误：
1.无法解析方法 onCreate 'onCreate.android.os.Bundle'
2. 方法不会在@Override 上覆盖其父类中的方法
这是收到错误消息的部分
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BUTTON = (Button) findViewById(R.id.button);
BUTTON.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
DemoAsync UploadFile = new DemoAsync();
UploadFile.execute();
}
});
}
这是 MainActivity.java 上的全部代码
package com.example.threadexample;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
public static final String DEMO_ASYNC = "DemoAsync";
private TextView B_PRESSED;
Button BUTTON;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
B_PRESSED = (TextView) findViewById(R.id.myTextView);
DemoAsync demoAsync = new DemoAsync();
demoAsync.execute("Button Pressed");
}
private class DemoAsync extends AsyncTask<String, Void, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
protected String doInBackground(String... params) {
Log.d(DEMO_ASYNC, "status : doInBackground");
try {
Thread.sleep(20000);
} catch (Exception e) {
Log.d(DEMO_ASYNC, e.getMessage());
}
return params[0];
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
B_PRESSED.setText(s);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BUTTON = (Button) findViewById(R.id.button);
BUTTON.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
DemoAsync UploadFile = new DemoAsync();
UploadFile.execute();
}
});
}
}
}
请详细说明我应该更改哪个部分，我是新手。感谢您的理解。
【问题讨论】：
标签： java android android-studio