[英]Custom View over XML Layout
我做了一个自定义的View DrawView.java,在其中画了一条简单的线。 我希望此自定义视图为MainActivity.java覆盖我的activity_main.xml。 为了进行测试,XML文件中有一个简单的Button。 绘制的线应在按钮上方绘制自己。 目前,绘制的线分别位于按钮下方和XML视图下方。
我如何才能做到这一点,而在理想环境中,仍然保持按钮可点击? ;)
DrawView.java
public class DrawView extends LinearLayout {
Paint paint = new Paint();
private int endX;
private int endY;
private int startX;
private int startY;
public DrawView(Context context) {
super(context);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mInflater.inflate(R.layout.activity_main, this, true);
paint.setColor(Color.BLACK);
paint.setStrokeWidth(10);
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawLine(startX, startY, endX, endY, paint);
}
public void setCoordinates(int startX, int startY, int endX, int endY) {
this.endX = endX;
this.endY = endY;
this.startX = startX;
this.startY = startY;
}}
MainActivity.java
public class MainActivity extends ActionBarActivity implements OnTouchListener{
DrawView drawView;
private int number;
private Handler handler;
private boolean Running = true;
private int endX = 500;
private int endY = 500;
private int startX = 50;
private int startY = 50;
private int frames = 25;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawView = new DrawView(this);
drawView.setBackgroundColor(Color.WHITE);
handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
while (Running) {
try {
Thread.sleep(40);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.post(new Runnable() {
@Override
public void run() {
int coordX = ((((endX - startX) / frames) * number))
+ startX;
int coordY = ((((endY - startY) / frames) * number))
+ startY;
number += 1;
drawView.setCoordinates(startX, startY, coordX,
coordY);
setContentView(drawView);
if ((coordX - endX) == 0 && coordY - endY ==0) {
Running = false;
}
}
});
}
// TODO Auto-generated method stub
}
};
new Thread(runnable).start();
}
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return false;
}}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="de.trialar.linedrawer.MainActivity"
>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="180dp"
android:text="Button" />
更新:
嗨,马丁,我尝试了您的解决方案,它对我来说很有用。 我改用了Imageview的方法。 当我单击一个按钮时,就画出了我的线条。 不幸的是,绘制此线时,不再调用我的onClicklistener。 但是按钮仍然是可点击的(默认的android按钮颜色变为蓝色)。
public class MainActivity extends ActionBarActivity implements OnTouchListener,
OnClickListener {
// DrawView drawView;
private int number;
private Handler handler;
private boolean Running = true;
private int endX = 50;
private int endY = 500;
private int startX = 50;
private int startY = 50;
private int frames = 25;
ImageView Line01;
Button button2;
Button buttonLineDrawer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// drawView = new DrawView(this);
// drawView.setBackgroundColor(Color.WHITE);
Line01 = (ImageView) findViewById(R.id.Line01);
Line01.setVisibility(View.GONE);
Button buttonLineDrawer;
buttonLineDrawer = (Button) findViewById(R.id.buttonLineDrawer);
buttonLineDrawer.setOnClickListener(this);
Button button2;
button2 = (Button) findViewById(R.id.button2);
button2.setOnClickListener(this);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.buttonLineDrawer:
Toast.makeText(getApplicationContext(), "klick", Toast.LENGTH_LONG)
.show();
Running = true;
number = 0;
drawLine();
break;
case R.id.button2:
Toast.makeText(getApplicationContext(), "klick", Toast.LENGTH_LONG)
.show();
break;
}
}
public void drawLine() {
Line01.setVisibility(View.VISIBLE);
handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
while (Running) {
try {
Thread.sleep(40);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.post(new Runnable() {
@Override
public void run() {
int coordX = ((((endX - startX) / frames) * number))
+ startX;
int coordY = ((((endY - startY) / frames) * number))
+ startY;
number += 1;
CustomDraw.setCoordinates(startX, startY, coordX,
coordY);
setContentView(R.layout.activity_main);
if ((coordX - endX) == 0 && coordY - endY == 0) {
Running = false;
}
}
});
}
}
};
new Thread(runnable).start();
}
}
您可以按一下按钮,然后在该按钮上自定义绘制吗?
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.widget.Button;
public class CustomDraw extends Button {
public CustomDraw(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public CustomDraw(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomDraw(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//your custom draw here
}
}
您还必须在布局中设置该按钮,然后...
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="de.trialar.linedrawer.MainActivity"
>
<com.example.yourpackage.CustomDraw
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="180dp"
android:text="Button" />
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