我正在按照在线教程进行按钮更改位置(从左上角到右下角),同时增加尺寸。我是使用transitionmanager做的。
TransitionManager.beginDelayedTransition(mylayout);
然后我想知道我是否可以从右下角到左上角做动画(这不包含在教程中,我只是出于纯粹的好奇心尝试了这一点)。我创建了另一个名为
的方法moveButtonBack();
每次调用moveButton或moveButtonBack()时,x变量都会增加1,如果x是偶数则调用moveButton,如果x是奇数,则调用moveButtonBack。顺便说一句,我在代码中添加了很多注释来跟踪事物。要在moveButtonBack中更改按钮大小,我使用变量H和W作为显示按钮的第一个高度和宽度。
问题
对我来说,代码似乎很好,我无法确定问题。当我在手机上运行时,按钮会发疯。文本在按钮上快速变化,并且以无组织的方式移动,或者当我触摸时移动到中心,当我放开时移动到顶部/底部,或者它保持在中心并且看起来好像在振动(迅速上下移动)。它具有300的恒定高度和450的宽度,而不是收缩和扩大。我不知道问题是什么,如果我得到帮助,我会非常感激。我花了一个多小时在代码中插入注释,并尝试通过更改听众,高度等内容来解决问题。
package com.example.my.transitions;
import android.nfc.Tag;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.*;
import android.widget.*;
import android.transition.*;
import android.support.v7.app.*;
public class MainActivity extends AppCompatActivity {
ViewGroup myslayout;
View mysButton; //Used in move and moveback
int x = 0;
double h;
double w;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myslayout = (ViewGroup) findViewById(R.id.myslayoutid);
myslayout.setOnTouchListener(
new RelativeLayout.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (x%2 == 0) {
moveButton();
return true;
}
else{
moveButtonBack();
return true;
}
return true; //touch listener as been handled
}
}
);
}
public void moveButton() {
Button mysButton = (Button) findViewById(R.id.mysbuttonid);
h = mysButton.getHeight();
w = mysButton.getWidth();
TransitionManager.beginDelayedTransition(myslayout);
//////////////////////Change position of button////////////////////////////
RelativeLayout.LayoutParams positionRules = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
positionRules.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.ALIGN_PARENT_BOTTOM);
positionRules.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, RelativeLayout.ALIGN_PARENT_RIGHT);
mysButton.setLayoutParams(positionRules);
/////////////////////////Change size of button////////////////////////////
ViewGroup.LayoutParams sizerules = mysButton.getLayoutParams();
sizerules.width = 450;
sizerules.height = 300;
mysButton.setLayoutParams(sizerules);
mysButton.setText("Height: " + sizerules.height + "Width: " + sizerules.width);
x++; //Make x odd, to be called as moveButtonBack next time
}
public void moveButtonBack(){
Button mysButton =(Button) findViewById(R.id.mysbuttonid);
TransitionManager.beginDelayedTransition(myslayout);
RelativeLayout.LayoutParams positionBackRules = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
positionBackRules.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.ALIGN_PARENT_TOP);
positionBackRules.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.ALIGN_PARENT_LEFT); //Move back to top left
mysButton.setLayoutParams(positionBackRules);
ViewGroup.LayoutParams sizebackrules = mysButton.getLayoutParams();
sizebackrules.height = (int) h;
sizebackrules.width = (int) w;
//I am typcasting h and w into ints in case it is a double, since .width and .height only take ints.
mysButton.setLayoutParams(sizebackrules);
mysButton.setText("Height: " + sizebackrules.height + "Width: " + sizebackrules.width + "h " + h + "w" + w);
x++; //Make x even again
}
@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);
}
}
同样,我真的很感激答案,因为我已经在这个问题上待了几个小时了!
答案 0 :(得分:1)
在if (head == NULL || head->data == '\0')
方法中,检查是否触及或触摸。只为其中一个事件编写移动按钮逻辑。
例如:
onTouch
的更多详情
关于按钮大小不变的问题:
将if (event.getAction() == MotionEvent.ACTION_DOWN) {
// Code for Move button / Move button back
}
和h
的计算移至活动w
方法可能有所帮助。