我试图以编程方式在Android中获取图像按钮的宽度和高度的整数变量。我想这样做是因为图像的大小会因设备而异。我怎样才能做到这一点？ 我已经试过了。
width = Image.getWidth();
height = image.getHeight();
但它返回零？
在API 22+中不推荐使用BitMap。获得实际图像的大小也不会起作用，因为我稍微扭曲它以适应我的需要。所以drawable.getIntrinsicHeight();不在桌面上（是的，我知道你必须宣布一个可绘制的，只是说drawable.getIntrinsicHeight而不是IDC）。我很困惑。请帮助！
完整代码：
package com.example.e99900004533.candycollector;
//imports for android, and Random
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.graphics.Point;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Display;
import android.widget.EditText;
import android.widget.ImageButton;
import android.os.CountDownTimer;
import android.graphics.drawable.Drawable;
import java.util.Random;
public class MainActivity extends ActionBarActivity {
//Original global variables. Non-static.
public EditText collectedTextEdit;
public EditText timerTextEdit;
public ImageButton candyEdit;
public int screenWidth;
public int screenHeight;
public int candyX;
public int candyY;
public int collected = 0;
public long time;
public boolean candyBag = false;
public String currentCandy = "candy";
public boolean running = true;
public int candyWidth;
public int candyHeight;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
collectedTextEdit = (EditText) findViewById(R.id.collectedText);
timerTextEdit = (EditText) findViewById(R.id.timerText);
candyEdit = (ImageButton) findViewById(R.id.candy);
candyEdit.setBackgroundResource(R.drawable.candy);
collectedTextEdit.setText("Collected: " + collected);
timerTextEdit.setText("Time: ");
//Sets timer to 30 seconds. Displays time. Ends game when time runs out.
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
time = millisUntilFinished / 1000;
timerTextEdit.setText("Time: " + time);
}
public void onFinish() {
//When game timer is complete.
timerTextEdit.setText("GAME OVER!!!");
collectedTextEdit.setText("Score: " + collected);
timerTextEdit.setX(screenWidth / 2); //Sets to middle of screen. Directly above score.
timerTextEdit.setY(screenHeight / 2);
collectedTextEdit.setX(screenWidth / 2); //Sets to middle of screen. Directly below score.
collectedTextEdit.setY(screenHeight / 3);
running = false;
candyEdit.setVisibility(View.INVISIBLE); //Makes candy Image invisible.
}
}.start();
//Gets screen width and height. Sets to two already created variables.
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
screenHeight = size.y;
candyWidth = candyEdit.getMeasuredWidthAndState(); //PROBLEM HERE!!
candyHeight = candyEdit.getMeasuredHeightAndState(); //PROBLEM HERE!!
addListenerOnButton();
}
//Onclick for ImageButton candy.
public void addListenerOnButton() {
candyEdit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (running) {
//Adds to collected and changes text.
collected += 1;
collectedTextEdit.setText("Collected: " + collected);
//Checks if CandyBag. Then resets.
if (candyBag) {
candyBag = false;
if (currentCandy.equals("candy")) {
candyEdit.setBackgroundResource(R.drawable.candy);
}
if (currentCandy.equals("candyTwo")) {
candyEdit.setBackgroundResource(R.drawable.candy2);
}
if (currentCandy.equals("candyThree")) {
candyEdit.setBackgroundResource(R.drawable.candy3);
}
}
//Gets new candy images at certain score.
if (collected >= 15 && collected < 30) {
candyEdit.setBackgroundResource(R.drawable.candy2);
currentCandy = "candyTwo";
}
if (collected >= 30) {
candyEdit.setBackgroundResource(R.drawable.candy3);
currentCandy = "candyThree";
}
//sets candy X and Y variables.
Random random = new Random();
candyX = random.nextInt(screenWidth - candyWidth * 2); //minus height and width of image.
candyY = random.nextInt(screenHeight - candyHeight * 2);
candyX += candyWidth;
candyY += candyHeight; //Plus extra to keep on screen.
//Sets candyBag if random = 1. 1 / x chance.
int candyRandom = random.nextInt(10);
if (candyRandom == 1) {
candyEdit.setBackgroundResource(R.drawable.candybag);
candyBag = true;
collected += 2;
}
//Makes sure candy is not off screen. Replaces if so.
while (candyX >= screenWidth - candyWidth || candyY >= screenHeight - candyHeight) {
if (candyX >= screenWidth || candyY >= screenHeight) {
candyX = random.nextInt(screenWidth - candyWidth * 2);
candyY = random.nextInt(screenHeight - candyHeight * 2);
candyX += candyWidth;
candyY += candyHeight;
}
}
//Sets candy X and Y.
System.out.println(candyX + " : " + candyY);
System.out.println((screenWidth - candyWidth * 2) + " : " + (screenHeight - candyHeight * 2));
System.out.println(candyWidth + " : " + candyHeight);
candyEdit.setX(candyX);
candyEdit.setY(candyY);
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:background="@drawable/background">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/collectedText"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:inputType="none"
android:text="@string/collectedText"
android:textColor="#ffffff"
android:textSize="25sp"
android:textStyle="bold"
android:singleLine="true"
android:clickable="false"
android:textIsSelectable="false"
android:editable="false" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/timerText"
android:layout_alignTop="@+id/collectedText"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:inputType="none"
android:text="@string/collectedText"
android:textColor="#ffffff"
android:textSize="25sp"
android:textStyle="bold"
android:singleLine="true"
android:clickable="false"
android:textIsSelectable="false"
android:editable="false" />
<ImageButton
android:layout_width="50dp"
android:layout_height="50dp"
android:id="@+id/candy"
android:background="@drawable/candy"
android:contentDescription="@string/candyImg"
android:clickable="true" />
</RelativeLayout>
答案 0 :(得分：1)
可能是，您过早地调用这些方法。在覆盖imageButton.post(new Runnable..)方法中将run()与getWidth和getHeight一起使用。
前段时间遇到同样的问题。这是因为过早调用width和height方法会导致它们为0，因为视图未正确初始化/测量。
答案 1 :(得分：0)
尝试测量宽度和高度 http://developer.android.com/reference/android/view/View.html#getMeasuredWidth()
http://developer.android.com/reference/android/view/View.html#getMeasuredHeight()
答案 2 :(得分：0)
您尝试在呈现布局之前测量尺寸，这在onCreate方法期间发生，因此该方法需要完成。解决此问题的最简单方法是创建一个runnable，它将在onCreate方法完成后执行代码：
myButton = (ImageButton) findViewById(R.id.YourButton);
myButton.post(new Runnable() {
@Override
public void run() {
int w = myButton.getMeasuredWidthandState();
int h = myButton.getMeasuredHeightandState();
...
}
});