我有一个简单的程序,我在java中为android做出的,但是在使得tablerow可点击时遇到困难。当用户点击一行时,我希望在下面的图像视图中显示某个图片。这里是我的XML代码:Android上的可点击桌面行
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FF909090"
android:stretchColumns="1" >
<TableRow>
<TextView
android:layout_margin="2dip"
android:layout_marginRight="2dip"
android:background="#0000ff"
android:padding="3dip"
android:text="I" />
<TextView
android:layout_margin="2dip"
android:layout_marginLeft="1dip"
android:background="#0000ff"
android:gravity="center"
android:padding="3dip"
android:text="A"
android:onClick="Achord" />
</TableRow>
<TableRow>
<TextView
android:layout_column="0"
android:layout_margin="2dip"
android:background="#0000ff"
android:padding="3dip"
android:text="II" />
<TextView
android:layout_margin="2dip"
android:background="#0000ff"
android:gravity="center"
android:padding="3dip"
android:text="Bm" />
</TableRow>
<TableRow>
<TextView
android:layout_column="0"
android:layout_margin="2dip"
android:background="#0000ff"
android:padding="3dip"
android:text="III" />
<TextView
android:layout_margin="2dip"
android:background="#0000ff"
android:gravity="center"
android:padding="3dip"
android:text="C#m" />
</TableRow>
<View
android:layout_height="2dip"
android:background="#FF909090" />
<TableRow android:background="#0000ff" >
</TableRow>
<TableRow>
<TextView
android:layout_margin="2dip"
android:background="#0000ff"
android:padding="3dip"
android:text="IV" />
<TextView
android:layout_margin="2dip"
android:background="#0000ff"
android:gravity="center"
android:padding="3dip"
android:text="D" />
</TableRow>
<View
android:layout_height="2dip"
android:background="#FF909090" />
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</TableRow>
<TableRow>
<TextView
android:layout_margin="2dip"
android:layout_marginRight="2dip"
android:background="#0000ff"
android:padding="3dip"
android:text="V" />
<TextView
android:layout_margin="2dip"
android:layout_marginLeft="1dip"
android:background="#0000ff"
android:gravity="center"
android:padding="3dip"
android:text="E" />
</TableRow>
<TableRow>
<TextView
android:layout_margin="2dip"
android:layout_marginRight="2dip"
android:background="#0000ff"
android:padding="3dip"
android:text="VI" />
<TextView
android:layout_margin="2dip"
android:layout_marginLeft="1dip"
android:background="#0000ff"
android:gravity="center"
android:padding="3dip"
android:text="F#m" />
</TableRow>
<TableRow>
<TextView
android:layout_margin="2dip"
android:layout_marginRight="2dip"
android:background="#0000ff"
android:padding="3dip"
android:text="VII" />
<TextView
android:layout_margin="2dip"
android:layout_marginLeft="1dip"
android:background="#0000ff"
android:gravity="center"
android:padding="3dip"
android:text="G#dim" />
</TableRow>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.05"
android:background="#000000"
android:maxLines="10"
android:text="The relative minor of the Major key of A is F#m. The 12 bar blues progression in A is: \n A | A | A | A | D | D | A | A | E | D | A | E" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.03"
android:src="@drawable/android_focused" />
,这里是我的Java代码:
package com.coreservlets.widgets;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TableRow;
import com.welly.keychords.R;
public class keya extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.keya);
}
}
我希望发生的那是什么imageview1将显示这取决于被点击哪一行不同的图像。任何帮助将不胜感激
萨姆建议我ammended我的代码如下:
public class keya extends Activity {
ImageView imagev = (ImageView) findViewById(R.id.imageView1);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.keya);
}
public void rowClick(View view) {
switch(view.getId()) {
case R.id.one:
// Load image from Drawable folder
imagev.setImageResource(R.drawable.android_normal); // example file for now
break;
}
}
}
,但现在我已经在运行的类空指针异常。所有编译罚款虽然
我已经改变了我的代码如下:公共类科亚延伸活动{ ImageView的imagev =(ImageView的)findViewById(R.id 。imageView1); @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.keya); } public void rowClick(View view){ switch(view.getId()){ case R.id.one: imagev.setImageResource(R.drawable.android_normal); 休息; } } }但在运行时产生空指针异常 – user1505181
请参阅我编辑的第一篇文章山姆,因为评论框不像代码 – user1505181
是的,评论有最小的标记功能。感谢您将代码添加到您的问题中,我希望更新能够让答案清楚。 – Sam