我正在处理我的 ondraw 方法无法正常工作的应用程序......在我的应用程序中我正在使用框架布局......所以我使用了三个类...... 1）活动 2）图像选择 3）绘图
我的图像选择工作正常，但我的绘图类工作不正常..它没有显示任何东西....我的绘图类如下......
public class Draw extends View {
String info = "";
float x = 0;
float y = 0;
int color = Color.GREEN;
public Draw(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public Draw(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
paint.setStyle(Paint.Style.FILL_AND_STROKE);
paint.setColor(color);
paint.setStrokeWidth(15);
paint.setTextSize(30);
canvas.drawLine(x-10, y, x+10, y, paint);
canvas.drawLine(x, y-10, x, y+10, paint);
canvas.drawText(info, x, y, paint);
}
public void updateInfo(String t_info, float t_x, float t_y){
info = t_info;
x = t_x;
y = t_y;
invalidate();
}
public void clearInfo(){
info = "";
x = 0;
y = 0;
invalidate();
}
}
我从我的 mainactivity 类中调用它。但我首先从图像选择类中调用它，如下所示
public class FirstImage extends ImageView implements OnTouchListener {
MotionEvent event;
int a;
Bitmap image;
String huma ="human";
String info = "human";
float x = 0; //init value
float y = 0; //init value
Animation animationFadeIn;
public FirstImage(Context context) {
super(context);
}
public FirstImage(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void changeImage(int id){
this.setImageResource(id);
a=id;
final Animation animationFadeout=AnimationUtils.loadAnimation(getContext(), R.anim.zoomin);
this.startAnimation(animationFadeout);
this.setOnTouchListener(this);
}
@Override
public boolean onTouch(View arg0, MotionEvent me) {
switch(me.getAction()){
case MotionEvent.ACTION_DOWN:
x=me.getX();
y= me.getY();
pageinfo(x,y);
break;
case MotionEvent.ACTION_MOVE:
x=me.getX();
y= me.getY();
pageinfo(x,y);
break;
case MotionEvent.ACTION_UP:
x=me.getX();
y= me.getY();
pageinfo(x,y);
break;
case MotionEvent.ACTION_OUTSIDE:
x=me.getX();
y= me.getY();
pageinfo(x,y);
break;
default: return true;
}
return false;
}
public void pageinfo(float x, float y) {
// TODO Auto-generated method stub
((AshActivity)getContext()).updateMsg(info, x,y);
}
}
它是从主要活动类中调用的
public class AshActivity extends Activity {
ImageView i;
Draw j;
TextView t,k;
ImageButton back;
ImageButton next;
OnClickListener l2 = null;
OnClickListener l = null;
int count=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
i = (FirstImage)findViewById(R.id.image);
j=(Draw)findViewById(R.id.info);
t=(TextView)findViewById(R.id.textView);
k=(TextView)findViewById(R.id.textView1);
back=(ImageButton)findViewById(R.id.button1);
next=(ImageButton)findViewById(R.id.button2);
if (count==0){
((FirstImage) i).changeImage(R.drawable.human);
}
//addListenerOnButton();
}
public void updateMsg(String info, float x, float y) {
// TODO Auto-generated method stub
j.updateInfo(info, x, y);
}
}
我的布局 xml 文件如下
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:name="http://schemas.android.com/apk/res/com.example.nam"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<!-- Screen Design for VIDEOS -->
<TableLayout
android:id="@+id/tablelayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="1">
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="15dip"
android:text="pic on click which will tell where is the dna located in human body or cell "
android:textSize="18dip" />
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<com.example.nam.FirstImage
android:id="@+id/image"
android:layout_height="wrap_content"
android:layout_width="fill_parent" />
<com.example.nam.Draw
android:id="@+id/info"
android:layout_height="wrap_content"
android:layout_width="fill_parent" />
</FrameLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageButton
android:id="@+id/button1"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:src="@drawable/monotone_arrow_next_left"/>
<ImageButton
android:id="@+id/button2"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:src="@drawable/monotone_arrow_next_lrightcopy"/>
</LinearLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="15dip"
android:text="please don't mind "
android:textSize="18dip" />
</TableRow>
</TableLayout>
</ScrollView>
什么问题我没明白....