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Java Android - ImageButton 显示但不允许我单击它

转载 作者:行者123 更新时间:2023-11-29 21:08:18 26 4
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我从一个具有 surfaceView 的类创建了“runGraphics.java”类的新实例。当它打开此类时,现在在放入 setContentView 时会遇到问题。在调用 runGraphics 类之前在不同的函数中调用它之前。这是我的 Activity :

  import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.Toast;

public class runGraphics extends Activity
{
ImageButton polarCap1;

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.graphics);
polarCap1 = (ImageButton) findViewById(R.id.polarCapButton);
polarCap1.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
Toast.makeText(runGraphics.this, "IT WORKED", Toast.LENGTH_LONG).show();
}//end onClick function
});//end setOnClickListener


}//end onCreate function
}//end runGraphics class

这是我的 xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ImageButton
android:id="@+id/polarCapButton"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/polarcap" />

</LinearLayout>

这是我添加 setContentView 后的 logcat:

05-21 16:52:38.726: E/AndroidRuntime(18959): FATAL EXCEPTION: Thread-17
05-21 16:52:38.726: E/AndroidRuntime(18959): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
05-21 16:52:38.726: E/AndroidRuntime(18959): at android.os.Handler.<init>(Handler.java:121)
05-21 16:52:38.726: E/AndroidRuntime(18959): at android.app.Activity.<init>(Activity.java:704)
05-21 16:52:38.726: E/AndroidRuntime(18959): at com.twentytwentythree.sab.runGraphics.<init>(runGraphics.java:11)
05-21 16:52:38.726: E/AndroidRuntime(18959): at com.twentytwentythree.sab.GraphicsSurface$SetupGraphicsSurface.run(GraphicsSurface.java:280)
05-21 16:52:38.726: E/AndroidRuntime(18959): at java.lang.Thread.run(Thread.java:1019)

最佳答案

public class runGraphics extends Activity {
ImageButton polarCap1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout.xml);//You need this code line.

polarCap1 = (ImageButton) findViewById(R.id.polarCapButton);
polarCap1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(runGraphics.this, "IT WORKED",
Toast.LENGTH_LONG).show();
}//end onClick function
});//end setOnClickListener


}//end onCreate function
}//end runGraphics class

关于Java Android - ImageButton 显示但不允许我单击它,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23793537/

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