JavaAndroid-ImageButton显示,但不允许我单击它
我从一个具有surfaceView的类创建了一个“runGraphics.java”类的新实例。当它打开这个类时,当setContentView被放入时,它现在遇到了一个问题。在调用runGraphics类之前,在另一个函数中调用它。 以下是我的活动:JavaAndroid-ImageButton显示,但不允许我单击它,java,android,image,button,imagebutton,Java,Android,Image,Button,Imagebutton,我从一个具有surfaceView的类创建了一个“runGraphics.java”类的新实例。当它打开这个类时,当setContentView被放入时,它现在遇到了一个问题。在调用runGraphics类之前,在另一个函数中调用它。 以下是我的活动: import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnC
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
以下是我的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$SetupGraphicsSurface.run(GraphicsSurface.java:280)
05-21 16:52:38.726: E/AndroidRuntime(18959): at java.lang.Thread.run(Thread.java:1019)
05-21 16:52:38.726:E/AndroidRuntime(18959):致命异常:Thread-17
05-21 16:52:38.726:E/AndroidRuntime(18959):java.lang.RuntimeException:无法在未调用Looper.prepare()的线程内创建处理程序
05-21 16:52:38.726:E/AndroidRuntime(18959):在android.os.Handler.(Handler.java:121)
05-21 16:52:38.726:E/AndroidRuntime(18959):在android.app.Activity.(Activity.java:704)
05-21 16:52:38.726:E/AndroidRuntime(18959):位于com.twentytwentythree.sab.runGraphics.(runGraphics.java:11)
05-21 16:52:38.726:E/AndroidRuntime(18959):位于com.twentytwentythree.sab.GraphicsSurface$SetupGraphicsSurface.run(GraphicsSurface.java:280)
05-21 16:52:38.726:E/AndroidRuntime(18959):在java.lang.Thread.run(Thread.java:1019)
您失踪了
setContentView(R.layout.activity_main);
这必须是您的onCreate()
方法:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); //add the line to load your .xml layout
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
此设置不允许我单击imagebutton。如果我触摸它,它什么也不做。你有线程或异步任务吗?在调用我的runGraphics类的类中,我让它在onResume函数中创建一个名为“ourthread”的新线程。同样在onResume中,一个名为isRunning的布尔有效值被设置为true,因此run函数将在为true时运行。还有一个不同的类扩展了Async,但它是独立的并保存单独的信息。您的错误是取消线程,因为您正在尝试向UI发送某个消息,put Looper.prepare()。在您的线程中,在向UI发送数据或某些信息之前,put Looper.prepare()我编辑了我的帖子,其中包括此添加的内容。我最初有这个,但它不像我上面描述的那样喜欢。我编辑了我的帖子,并在其中添加了这个。我本来有这个,但它不像我上面描述的那样。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); //add the line to load your .xml layout
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
public class runGraphics extends Activity implements OnClickListener {
ImageButton polarCap1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
polarCap1 = (ImageButton) findViewById(R.id.polarCapButton);
polarCap1.setOnClickListener(this);
}//end onCreate function
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.polarCapButton:
Toast.makeText(runGraphics.this, "IT WORKED", Toast.LENGTH_LONG).show();
break;
}
}
}