Android 如何在两个点之间画线，而不是在布局中的其他位置
我们希望创建一个类似于以下匹配的布局 到目前为止，我们能够在画布上画一条线，但它正在整个布局上绘制 我们希望在两点之间创建一条线，其中两点都是ImageView。另外，我希望这条线不应该画在除了两点以外的任何地方，这意味着它应该只画在这些点之间。如果与正确答案匹配，则应变为绿色，否则变为红色 以下是相同的代码：Android 如何在两个点之间画线，而不是在布局中的其他位置,android,android-layout,android-canvas,android-bitmap,Android,Android Layout,Android Canvas,Android Bitmap,我们希望创建一个类似于以下匹配的布局 到目前为止，我们能够在画布上画一条线，但它正在整个布局上绘制 我们希望在两点之间创建一条线，其中两点都是ImageView。另外，我希望这条线不应该画在除了两点以外的任何地方，这意味着它应该只画在这些点之间。如果与正确答案匹配，则应变为绿色，否则变为红色 以下是相同的代码： import android.app.Activity; import android.content.Context; import a
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewStub;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class new_sept_1 extends Activity {
TextView tv_name8, tv_activity8, tv_time8, tv_class8;
Button bt_submit8;
ProgressBar pb_que8;
ImageView line_1, line_2, line_3, line_4, drop_1, drop_2,cdrag,cdrop;
FrameLayout FL;
// TheSurface sp;
//DrawView dp;
DrawPaint dp;
private Paint mPaint;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_8_sept_1);
//ViewStub Stub = (ViewStub) findViewById(R.id.stub);
FL = (FrameLayout) findViewById(R.id.fl_main);
// LayoutInflater inflater = getLayoutInflater();
//View layer1 = inflater.inflate(R.layout.layer_1, null);
dp = new DrawPaint(this);
FL.addView(dp);
// FL.addView(dp);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.STROKE);
//mPaint.setStrokeJoin(Paint.Join.ROUND);
//mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(6);
tv_activity8 = (TextView) findViewById(R.id.tv_activity_8);
tv_class8 = (TextView) findViewById(R.id.tv_class8);
tv_name8 = (TextView) findViewById(R.id.tv_sept_name8);
tv_time8 = (TextView) findViewById(R.id.tv_time_8);
/* line_1 = (ImageView) findViewById(R.id.iv_tyre);
drop_1 = (ImageView) findViewById(R.id.iv_dropT);
line_2 = (ImageView) findViewById(R.id.iv_sugar);
drop_2 = (ImageView) findViewById(R.id.iv_drop_2);
cdrag = (ImageView)findViewById(R.id.iv_c_tyre);
cdrop = (ImageView)findViewById(R.id.iv_cdropT);*/
bt_submit8 = (Button) findViewById(R.id.bt_submit_8_sept_1);
pb_que8 = (ProgressBar) findViewById(R.id.pb_que8);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
Toast.makeText(getApplicationContext(), "height " + height + " width " + width, Toast.LENGTH_SHORT).show();
/*line_1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int[] values = new int[2];
v.getLocationOnScreen(values);
Log.d("X & Y",values[0]+" "+values[1]);
//Toast.makeText(getApplicationContext(),"x"+values,Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(),"DRAG",Toast.LENGTH_SHORT).show();
}
});
drop_1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FL.removeView(dp);
Toast.makeText(getApplicationContext(),"Drop",Toast.LENGTH_SHORT).show();
}
});*/
// FL.removeView(dp);
}
public class DrawPaint extends View {
public int width;
public int height;
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
Context context;
private Paint circlePaint;
private Path circlePath;
public DrawPaint(Context c) {
super(c);
context = c;
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
circlePaint = new Paint();
circlePath = new Path();
circlePaint.setAntiAlias(true);
circlePaint.setColor(Color.BLACK);
circlePaint.setStyle(Paint.Style.STROKE);
circlePaint.setStrokeJoin(Paint.Join.MITER);
circlePaint.setStrokeWidth(4f);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
// Toast.makeText(getApplicationContext(),"new "+w +h +"old"+oldh+oldw,Toast.LENGTH_SHORT).show();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
canvas.drawPath(circlePath, circlePaint);
// Toast.makeText(getApplicationContext(),"x y ",Toast.LENGTH_SHORT).show();
}
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void touch_start(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
// mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
//circlePath.reset();
circlePath.addCircle(mX, mY, 1, Path.Direction.CCW);
} else {
circlePath.reset();
}
}
private void touch_up() {
// mPath.lineTo(200,310);
mPath.lineTo(mX, mY);
circlePath.reset();
mCanvas.drawPath(mPath, mPaint);
mCanvas.drawPath(mPath, mPaint);
// mPath = new Path();
// Paint.add(mPath);
// mPath.reset();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//int action = event.getAction();
// View parentRow = (View) v.getParent();
//float x = line_1.getX();
//float y = line_1.getY();
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
/* float x1 = line_1.getX();
float y1 = drop_1.getY();*/
touch_up();
invalidate();
mPath.reset();
circlePath.reset();
invalidate();
// mPath.moveTo(x1, y1);
//mPath.lineTo(20,10);
// mCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
invalidate();
break;
case MotionEvent.ACTION_CANCEL:
invalidate();
break;
}
return true;
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/fm_header8">
<ImageView
android:layout_width="126dp"
android:layout_height="wrap_content"
android:id="@+id/imageView8"
android:src="@mipmap/ic_launcher"
android:layout_gravity="left|center_vertical" />
<ImageView
android:layout_width="50dp"
android:layout_height="36dp"
android:id="@+id/iv_student_img8"
android:layout_marginRight="70dp"
android:src="@mipmap/ic_launcher"
android:layout_gravity="right|center_vertical" />
<TextView
android:layout_width="146dp"
android:layout_height="wrap_content"
android:text="Name"
android:id="@+id/tv_sept_name8"
android:layout_marginRight="120dp"
android:layout_gravity="right|top"
android:textIsSelectable="false"
android:textSize="13dp"
android:typeface="serif"
android:textColor="@color/abc_primary_text_material_light" />
<TextView
android:layout_width="146dp"
android:layout_height="wrap_content"
android:text="Class"
android:id="@+id/tv_class8"
android:layout_marginRight="120dp"
android:layout_gravity="right|center_vertical"
android:textSize="13dp"
android:typeface="serif"
android:textColor="@color/abc_primary_text_material_light" />
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="161dp"
android:layout_height="wrap_content"
android:layout_marginRight="70dp"
android:id="@+id/pb_que8"
android:layout_gravity="center" />
<ImageView
android:layout_width="47dp"
android:layout_height="47dp"
android:id="@+id/iv_audio8"
android:layout_gravity="right|center_vertical"
android:src="@drawable/audio"/>
<TextView
android:layout_width="120dp"
android:layout_height="wrap_content"
android:text="Activity "
android:layout_marginStart="220dp"
android:id="@+id/tv_activity_8"
android:layout_gravity="center_horizontal|bottom"
android:textColor="@color/abc_primary_text_disable_only_material_light"
android:textSize="13dp"
android:typeface="serif"
android:layout_marginRight="120dp" />
<TextView
android:layout_width="138dp"
android:layout_height="wrap_content"
android:text="Time"
android:layout_marginStart="150dp"
android:id="@+id/tv_time_8"
android:layout_gravity="left|bottom"
android:textColor="@color/abc_primary_text_material_light"
android:textSize="13dp"
android:typeface="serif" />
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/new_bg"
android:id="@+id/ll_main">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Match the product with the plants from which they are obtained"
android:id="@+id/tv_que_8"
android:layout_gravity="center_horizontal|top"
android:layout_marginTop="20dp"
android:fontFamily="serif"
android:textSize="15dp"
android:textColor="@color/abc_primary_text_material_light"
android:background="@color/background_material_light" />
<Button
android:layout_width="50dp"
android:layout_height="50dp"
android:text="submit"
android:background="@drawable/gradient_button"
android:id="@+id/bt_submit_8_sept_1"
android:layout_gravity="right|bottom"
android:textColor="@color/abc_primary_text_disable_only_material_light"
android:textSize="10dp"
android:paddingLeft="0dp"
android:paddingEnd="0dp"
android:layout_marginRight="2dp"
android:layout_marginBottom="2dp" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fl_main">
</FrameLayout>
</FrameLayout>
</LinearLayout>
这绝对是您所需要的-