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java - 通过单击按钮展开和折叠 Relativelayout

转载 作者:太空宇宙 更新时间:2023-11-03 13:43:40 24 4
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我有这个 RelativeLayout,它在单击按钮时展开和折叠它在一个按钮上工作正常。我想在更多两个 RelativeLayout 上重用相同的方法在相同的布局并使用其他两个按钮展开。

这段代码运行良好。只是想要更多布局来执行相同的操作。

布局: enter image description here

这是我的代码:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<RelativeLayout

android:layout_width="fill_parent"
android:layout_height="64dp"
android:background="#FFF"
android:orientation="vertical">

<TextView

android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Title"
android:textSize="20sp" />

<Button
android:id="@+id/viewmore"
android:layout_width="80dp"
android:layout_height="match_parent"
android:layout_marginLeft="280dp"
android:background="@null"
android:text="viewmore" />


</RelativeLayout>


<RelativeLayout

android:visibility="gone"
android:id="@+id/expandable"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:animateLayoutChanges="true"
android:background="@color/colorAccent"
android:orientation="vertical">


<TextView

android:layout_width="match_parent"
android:layout_height="133dp"
android:text="Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters"
android:textSize="20sp" />


</RelativeLayout>


<RelativeLayout


android:layout_width="match_parent"
android:layout_height="wrap_content">

<TextView
android:id="@+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Title 2"
android:textSize="20sp" />

<Button
android:id="@+id/viewmore1"
android:layout_width="80dp"
android:layout_height="match_parent"
android:layout_marginLeft="280dp"
android:background="@null"
android:text="viewmore" />


</RelativeLayout>

<RelativeLayout
android:visibility="gone"
android:animateLayoutChanges="true"
android:id="@+id/expandable1"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_marginTop="30dp"
android:background="@color/colorPrimary">

<TextView

android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters"
android:textSize="20sp" />


</RelativeLayout>

<RelativeLayout

android:layout_width="match_parent"
android:layout_height="wrap_content">

<TextView

android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Title 3"
android:textSize="20sp" />

<Button
android:id="@+id/viewmore2"
android:layout_width="80dp"
android:layout_height="match_parent"
android:layout_marginLeft="280dp"
android:background="@null"
android:text="viewmore" />


</RelativeLayout>

<RelativeLayout
android:visibility="gone"
android:animateLayoutChanges="true"
android:id="@+id/expandable2"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_marginTop="30dp"
android:background="@color/colorPrimary">

<TextView

android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters"
android:textSize="20sp" />


</RelativeLayout>


</LinearLayout>
</ScrollView>

源代码:

RelativeLayout relativeLayout, relativeLayout1, relativeLayout2;
Button viewmore, viewmore1, viewmore2;
ValueAnimator mAnimator;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.viewmore);


relativeLayout = (RelativeLayout) findViewById(R.id.expandable);
relativeLayout1 = (RelativeLayout) findViewById(R.id.expandable1);
relativeLayout2 = (RelativeLayout) findViewById(R.id.expandable2);


viewmore = (Button) findViewById(R.id.viewmore);
viewmore1 = (Button) findViewById(R.id.viewmore1);
viewmore2 = (Button) findViewById(R.id.viewmore2);

viewmore.setOnClickListener(this);
viewmore1.setOnClickListener(this);
viewmore2.setOnClickListener(this);


relativeLayout.getViewTreeObserver().addOnPreDrawListener(
new ViewTreeObserver.OnPreDrawListener() {

@Override
public boolean onPreDraw() {
relativeLayout.getViewTreeObserver().removeOnPreDrawListener(this);
relativeLayout.setVisibility(View.GONE);

final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
relativeLayout.measure(widthSpec, heightSpec);

mAnimator = slideAnimator(0, relativeLayout.getMeasuredHeight());
return true;
}
});


}


private void expand() {

relativeLayout.setVisibility(View.VISIBLE);
mAnimator.start();
}

private void collapse() {
int finalHeight = relativeLayout.getHeight();

ValueAnimator mAnimator = slideAnimator(finalHeight, 0);

mAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationEnd(Animator animator) {
//Height=0, but it set visibility to GONE
relativeLayout.setVisibility(View.GONE);
}

@Override
public void onAnimationStart(Animator animator) {
}

@Override
public void onAnimationCancel(Animator animator) {
}

@Override
public void onAnimationRepeat(Animator animator) {
}
});
mAnimator.start();
}


private ValueAnimator slideAnimator(int start, int end) {

ValueAnimator animator = ValueAnimator.ofInt(start, end);


animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
//Update Height
int value = (Integer) valueAnimator.getAnimatedValue();

ViewGroup.LayoutParams layoutParams = relativeLayout.getLayoutParams();
layoutParams.height = value;
relativeLayout.setLayoutParams(layoutParams);
}
});
return animator;
}


@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.viewmore:

if (relativeLayout.getVisibility() == View.GONE) {
expand();
} else {
collapse();
}

break;


case R.id.viewmore1:


break;

case R.id.viewmore2:


break;


}
}

最佳答案

要继续您的方法,您必须将代码应用到您布置的所有三个部分。为此,您需要更改几个方法以接受 RelativeLayout 作为参数。

首先,在您的 onClick 监听器中,填充 case block ,以便每个 block 调用 expand() 目标 RelativeLayout 和最大高度.使用目标 RelativeLayout 调用 collapse()。然后您需要修改 expand()collapse() 来处理新参数:

您会在下面的代码中注意到我已经更改了创建动画器的方式和位置。动画师需要处理每个 RelativeLayout

因此,onClick() 调用 expand(),后者调用 slideAnimator()。对于每个调用,受影响的 RelativeLayout 作为参数传递。通过这种方式,您可以概括代码以使用多个 RelativeLayout

预绘制监听器还需要测量每个可扩展的 RelativeLayout

下面是全部内容:

MainActivity.xml

public class MainActivity extends AppCompatActivity
implements View.OnClickListener {

RelativeLayout relativeLayout, relativeLayout1, relativeLayout2;
Button viewmore, viewmore1, viewmore2;
int height, height1, height2;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.viewmore);

relativeLayout = (RelativeLayout) findViewById(R.id.expandable);
relativeLayout1 = (RelativeLayout) findViewById(R.id.expandable1);
relativeLayout2 = (RelativeLayout) findViewById(R.id.expandable2);

viewmore = (Button) findViewById(R.id.viewmore);
viewmore1 = (Button) findViewById(R.id.viewmore1);
viewmore2 = (Button) findViewById(R.id.viewmore2);

viewmore.setOnClickListener(this);
viewmore1.setOnClickListener(this);
viewmore2.setOnClickListener(this);


relativeLayout.getViewTreeObserver().addOnPreDrawListener(
new ViewTreeObserver.OnPreDrawListener() {

@Override
public boolean onPreDraw() {
relativeLayout.getViewTreeObserver().removeOnPreDrawListener(this);
relativeLayout.setVisibility(View.GONE);
relativeLayout1.setVisibility(View.GONE);
relativeLayout2.setVisibility(View.GONE);

final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
relativeLayout.measure(widthSpec, heightSpec);
height = relativeLayout.getMeasuredHeight();
relativeLayout1.measure(widthSpec, heightSpec);
height1 = relativeLayout.getMeasuredHeight();
relativeLayout2.measure(widthSpec, heightSpec);
height2 = relativeLayout.getMeasuredHeight();
return true;
}
});
}


private void expand(RelativeLayout layout, int layoutHeight) {
layout.setVisibility(View.VISIBLE);
ValueAnimator animator = slideAnimator(layout, 0, layoutHeight);
animator.start();
}

private void collapse(final RelativeLayout layout) {
int finalHeight = layout.getHeight();
ValueAnimator mAnimator = slideAnimator(layout, finalHeight, 0);

mAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationEnd(Animator animator) {
//Height=0, but it set visibility to GONE
layout.setVisibility(View.GONE);
}

@Override
public void onAnimationStart(Animator animator) {
}

@Override
public void onAnimationCancel(Animator animator) {
}

@Override
public void onAnimationRepeat(Animator animator) {
}
});
mAnimator.start();
}


private ValueAnimator slideAnimator(final RelativeLayout layout, int start, int end) {
ValueAnimator animator = ValueAnimator.ofInt(start, end);

animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
//Update Height
int value = (Integer) valueAnimator.getAnimatedValue();

ViewGroup.LayoutParams layoutParams = layout.getLayoutParams();
layoutParams.height = value;
layout.setLayoutParams(layoutParams);
}
});
return animator;
}

@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.viewmore:
if (relativeLayout.getVisibility() == View.GONE) {
expand(relativeLayout, height);
} else {
collapse(relativeLayout);
}
break;

case R.id.viewmore1:
if (relativeLayout1.getVisibility() == View.GONE) {
expand(relativeLayout1, height1);
} else {
collapse(relativeLayout1);
}
break;

case R.id.viewmore2:
if (relativeLayout2.getVisibility() == View.GONE) {
expand(relativeLayout2, height2);
} else {
collapse(relativeLayout2);
}
break;
}
}
}

关于java - 通过单击按钮展开和折叠 Relativelayout,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46478952/

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