java - 如何画一条沿着我的手指的线
问题描述
我正在尝试在 Android 中画一条线，但我遇到了类onTouch事件和类事件的问题。由于某种原因，该事件起作用并停止了. 当我从我的 XML 中删除视图时，然后工作。请问我怎样才能让这两个工作。FingerLineonTouchListenerGameActivityonTouchFingerLineGameActivity TouchlistenersFingerLineGameActivity Touchlisteners
Fingerline.Java
import android.content.Context;
import android.graphics.*;
import android.graphics.Paint.Style;
import androidx.annotation.NonNull;
import android.util.AttributeSet;
import android.util.Log;
import android.view.*;
import androidx.annotation.NonNull;
public class FingerLine extends View {
private final Paint mPaint;
private float startX;
private float startY;
private float endX;
private float endY;
private float newstartX;
private float newstartY;
private float newendX;
private float newendY;
GameActivity gactivity=new GameActivity();
public FingerLine(Context context) {
this(context, null);
}
public FingerLine(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Style.STROKE);
mPaint.setColor(Color.RED);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(12);
}
@Override protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawLine(startX, startY, endX, endY, mPaint);
canvas.drawLine(newstartX, newstartY, newendX, newendY, mPaint);
}
@Override
public boolean onTouchEvent(@NonNull MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startX = event.getX();
startY = event.getY();
// Set the end to prevent initial jump (like on the demo recording)
endX = event.getX();
endY = event.getY();
invalidate();
break;
case MotionEvent.ACTION_MOVE:
endX = event.getX();
endY = event.getY();
invalidate();
break;
case MotionEvent.ACTION_UP:
endX = event.getX();
endY = event.getY();
invalidate();
break;
}
return true;
}
}
游戏活动.java
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.lang.reflect.Array;
import java.util.ArrayList;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
public class GameActivity extends AppCompatActivity{
ConstraintLayout Letter_panel;
FingerLine fline;
TextView letter_button_one;
TextView letter_button_two;
TextView letter_button_three;
TextView letter_button_four;
TextView letter_button_five;
Boolean one_isTouched=false;
Boolean two_isTouched=false;
Boolean three_isTouched=false;
Boolean four_isTouched=false;
Boolean five_isTouched=false;
TextView textpad;
String textpadtext="";
private float startX;
private float startY;
private float endX;
private float endY;
ArrayList myTextviews;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
// how activity in full screen
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN); //show the activity in full screen
Letter_panel=this.findViewById(R.id.constraintLayout4);
letter_button_one=this.findViewById(R.id.text_one);//for top A
letter_button_two=this.findViewById(R.id.text_two);//for top M
letter_button_three=this.findViewById(R.id.text_three);//for top A
letter_button_four=this.findViewById(R.id.text_four);//for top E
letter_button_five=this.findViewById(R.id.text_five);//for top Z
textpad=this.findViewById(R.id.textpad);
textpad.setVisibility(View.INVISIBLE);
letter_button_Method();
}
private void letter_button_Method() {
Letter_panel.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
Log.d("tag","in onTouch...");
checkTouch(event);
return true;
}
});
}
public void checkTouch(MotionEvent event) {
float x = event.getX();
float y = event.getY();
if((letter_button_one.getLeft() <= x) && (x <= letter_button_one.getRight())) { if((letter_button_one.getTop() <= y) && (y <= letter_button_one.getBottom())&& one_isTouched==false) {
//For Letter A 1
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_one.getText();
textpad.setText(""+textpadtext);
one_isTouched=true;// used to know if first button was touched
}
}else
if((letter_button_two.getLeft() <= x) && (x <= letter_button_two.getRight())) { if((letter_button_two.getTop() <= y) && (y <= letter_button_two.getBottom())&& two_isTouched==false) {
//For Letter M 2
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_two.getText();
textpad.setText(""+textpadtext);
two_isTouched=true;
}
}else
if((letter_button_three.getLeft() <= x) && (x <= letter_button_three.getRight())) { if((letter_button_three.getTop() <= y) && (y <= letter_button_three.getBottom())&& three_isTouched==false) {
//For Letter A 3
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_three.getText();
textpad.setText(""+textpadtext);
three_isTouched=true;
}
}else
if((letter_button_four.getLeft() <= x) && (x <= letter_button_four.getRight())) { if((letter_button_four.getTop() <= y) && (y <= letter_button_four.getBottom())&& four_isTouched==false) {
//For Letter E 4
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_four.getText();
textpad.setText(""+textpadtext);
four_isTouched=true;
}
}else
if((letter_button_five.getLeft() <= x) && (x <= letter_button_five.getRight())) { if((letter_button_five.getTop() <= y) && (y <= letter_button_five.getBottom())&& five_isTouched==false) {
//For Letter Z 5
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_five.getText();
textpad.setText(""+textpadtext);
five_isTouched=true;
}
}
switch (event.getAction()) {
case MotionEvent.ACTION_UP:
all_letters_buttonFalse();//turns all letter pressed state back to false
textpadtext="";
textpad.setText(""+textpadtext);
textpad.setVisibility(View.INVISIBLE);
break;
}
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus) {
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
public void all_letters_buttonFalse(){
one_isTouched=false;
two_isTouched=false;
three_isTouched=false;
four_isTouched=false;
five_isTouched=false;
}
}
然后这就是我通过 XML 添加和显示手指线视图的方式。
活动游戏.xml
android:id="@+id/constraintLayout4"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="53dp"
android:background="@drawable/letters_panel"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent="0.70"
app:layout_constraintHorizontal_bias="0.211"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.368"
app:layout_constraintWidth_percent="0.65">
<store.imastudio.wordmaster.FingerLine
android:id="@+id/draw"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHeight_percent="0.05"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0">
</com.homestudio.wmaster.FingerLine> ```
解决方案
删除Fingerline Viewfromactivity_game.xml并使用以下代码
GameActivity
public class GameActivity extends AppCompatActivity{
ConstraintLayout Letter_panel;
FingerLine fline;
TextView letter_button_one;
TextView letter_button_two;
TextView letter_button_three;
TextView letter_button_four;
TextView letter_button_five;
Boolean one_isTouched=false;
Boolean two_isTouched=false;
Boolean three_isTouched=false;
Boolean four_isTouched=false;
Boolean five_isTouched=false;
TextView textpad;
String textpadtext="";
private float startX;
private float startY;
private float endX;
private float endY;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
// how activity in full screen
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN); //show the activity in full screen
Letter_panel=this.findViewById(R.id.constraintLayout4);
letter_button_one=this.findViewById(R.id.text_one);//for top A
letter_button_two=this.findViewById(R.id.text_two);//for top M
letter_button_three=this.findViewById(R.id.text_three);//for top A
letter_button_four=this.findViewById(R.id.text_four);//for top E
letter_button_five=this.findViewById(R.id.text_five);//for top Z
textpad=this.findViewById(R.id.textpad);
textpad.setVisibility(View.INVISIBLE);
FingerLine fingerLine=new FingerLine(this);//For line
FingerLine.addView(fingerline);// For line
letter_button_Method();
}
private void letter_button_Method() {
Letter_panel.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
Log.d("tag","in onTouch...");
checkTouch(event);
return true;
}
});
}
public void checkTouch(MotionEvent event) {
float x = event.getX();
float y = event.getY();
if((letter_button_one.getLeft() <= x) && (x <= letter_button_one.getRight())) { if((letter_button_one.getTop() <= y) && (y <= letter_button_one.getBottom())&& one_isTouched==false) {
//For Letter A 1
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_one.getText();
textpad.setText(""+textpadtext);
one_isTouched=true;// used to know if first button was touched
}
}else
if((letter_button_two.getLeft() <= x) && (x <= letter_button_two.getRight())) { if((letter_button_two.getTop() <= y) && (y <= letter_button_two.getBottom())&& two_isTouched==false) {
//For Letter M 2
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_two.getText();
textpad.setText(""+textpadtext);
two_isTouched=true;
}
}else
if((letter_button_three.getLeft() <= x) && (x <= letter_button_three.getRight())) { if((letter_button_three.getTop() <= y) && (y <= letter_button_three.getBottom())&& three_isTouched==false) {
//For Letter A 3
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_three.getText();
textpad.setText(""+textpadtext);
three_isTouched=true;
}
}else
if((letter_button_four.getLeft() <= x) && (x <= letter_button_four.getRight())) { if((letter_button_four.getTop() <= y) && (y <= letter_button_four.getBottom())&& four_isTouched==false) {
//For Letter E 4
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_four.getText();
textpad.setText(""+textpadtext);
four_isTouched=true;
}
}else
if((letter_button_five.getLeft() <= x) && (x <= letter_button_five.getRight())) { if((letter_button_five.getTop() <= y) && (y <= letter_button_five.getBottom())&& five_isTouched==false) {
//For Letter Z 5
Log.d("tag","this touch is in button area");
// do what you want to do when touch/click comes in button area
textpad.setVisibility(View.VISIBLE);
textpadtext=textpadtext+letter_button_five.getText();
textpad.setText(""+textpadtext);
five_isTouched=true;
}
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startX = event.getX();
startY = event.getY();
// Set the end to prevent initial jump (like on the demo recording)
endX = event.getX();
endY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
endX = event.getX();
endY = event.getY();
break;
case MotionEvent.ACTION_UP:
all_letters_buttonFalse();//turns all letter pressed state back to false
textpadtext="";
textpad.setText(""+textpadtext);
textpad.setVisibility(View.INVISIBLE);
//code below is for drawing line
endX = event.getX();
endY = event.getY();
break;
}
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus) {
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
public void all_letters_buttonFalse(){
one_isTouched=false;
two_isTouched=false;
three_isTouched=false;
four_isTouched=false;
five_isTouched=false;
}
public class FingerLine extends View {
private final Paint mPaint;
public FingerLine(Context context) {
this(context, null);
}
public FingerLine(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setColor(Color.RED);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(12);
}
@Override protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawLine(startX, startY, endX, endY, mPaint);
invalidate();
}
}
}
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