Java android：按钮 onClick()，无法判断是否发生任何事情
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android: button onClick(), cant tell if anything is happening
提问by JoshuaBen
My Activity onClick() below doesn't appear to be doing anything (not seeing any string appear), yet I dont get any errors. What am I missing? Is there a way to trace the function?
我下面的 Activity onClick() 似乎没有做任何事情（没有看到任何字符串出现），但我没有收到任何错误。我错过了什么？有没有办法跟踪功能？
package com.HelloTabWidget2;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.TextView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;
public class AlbumsActivity extends Activity {
private Button closeButton;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.tab1);
this.closeButton = (Button)this.findViewById(R.id.button);
this.closeButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(AlbumsActivity.this, "You clicked the button", Toast.LENGTH_SHORT).show();
}
});
}
}
Thanks!
谢谢！
回答by Travis
I believe the issue is with the anonymous method, I get an error when trying to use your code. Just add the impliments OnClickListenter.
我相信问题出在匿名方法上，尝试使用您的代码时出现错误。只需添加实现 OnClickListenter。
If you have more than one button, you'll need to add a switch or something on v.getId().
如果您有多个按钮，则需要在 v.getId() 上添加一个开关或其他内容。
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class AlbumsActivity extends Activity implements OnClickListener {
private Button closeButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.closeButton = (Button)this.findViewById(R.id.button);
this.closeButton.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Toast.makeText(this, "You clicked the button", Toast.LENGTH_SHORT).show();
}
}
回答by Tsunaze
I would say that instead of writing the below code
我会说，而不是编写下面的代码
...setOnClickListener(new OnClickListener() {..."
I would prefer the following ocde
我更喜欢以下 ocde
"...setOnClickListener(new View.OnClickListener() {..."
回答by JibW
You can simply use following code
您可以简单地使用以下代码
Button closeButton = (Button) findViewById(R.id.button);
closeButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Onclick works", Toast.LENGTH_LONG).show();
}
});
If it provides exception, go and do Project -> Clean. Things will work properly
如果它提供异常，请执行 Project -> Clean。事情会正常进行
