我从具有surfaceView的类中创建“ runGraphics.java”类的新实例。当打开此类时,现在放入setContentView时会遇到问题。在调用runGraphics类之前,在另一个函数中调用它之前。
这是我的活动:
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之后的日志:
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