我做了一个我想为RadioButton
实现的自定义布局。android类的代码在这里:
public class MyRadioButton extends LinearLayout implements View.OnClickListener{
private ImageView iv;
private TextView tv;
private RadioButton rb;
private View view;
public MyRadioButton(Context context) {
super(context);
view = View.inflate(context, R.layout.my_radio_button, this);
setOrientation(HORIZONTAL);
rb = (RadioButton) view.findViewById(R.id.radioButton1);
tv = (TextView) view.findViewById(R.id.textView1);
iv = (ImageView) view.findViewById(R.id.imageView1);
view.setOnClickListener(this);
rb.setOnCheckedChangeListener(null);
}
public void setImageBitmap(Bitmap bitmap) {
iv.setImageBitmap(bitmap);
}
public View getView() {
return view;
}
@Override
public void onClick(View v) {
boolean nextState = !rb.isChecked();
LinearLayout lGroup = (LinearLayout)view.getParent();
if(lGroup != null){
int child = lGroup.getChildCount();
for(int i=0; i<child; i++){
//uncheck all
((RadioButton)lGroup.getChildAt(i).findViewById(R.id.radioButton1)).setChecked(false);
}
}
rb.setChecked(nextState);
}
public void setImage(Bitmap b){
iv.setImageBitmap(b);
}
public void setText(String text){
tv.setText(text);
}
public void setChecked(boolean isChecked){
rb.setChecked(isChecked);
}
}
和布局代码在这里
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal" >
<RadioButton
android:id="@+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="top"
android:text="" />
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/wow_visa_prepaid" />
</LinearLayout>
</LinearLayout>
目前,我不知道如何将继承从LinearLayout
更改为RadioButton
并保持相同的布局。
我已经尝试了以下代码,并且可以正常工作且没有错误:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
tools:context=".MainActivity">
<com.example.myapplication.MyRadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
更改以下代码后:
public MyRadioButton(Context context) {
至以下代码:
public MyRadioButton(Context context, AttributeSet attributes) {
这是您需要的解决方案吗?
有许多实现此类单选按钮的库,例如
https://github.com/ceryle/RadioRealButton
有两种方法可以完成这项工作:
1。当我们听到一个自定义视图时,它驱使我们重写onDraw
方法,然后将所需的内容绘制到视图的Canvas
中。
2。在这种情况下,有一种使用drawableLeft
的简单方法。在这里,我扩展了AppCompatRadioButton
并将所考虑的布局设置为drawableLeft
。
MyRadioButton.java
package com.aminography.radiobutton;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
// TODO: If you are using androidx
import androidx.appcompat.widget.AppCompatRadioButton;
// TODO: If you are using appcompat
//import android.support.v7.widget.AppCompatRadioButton;
public class MyRadioButton extends AppCompatRadioButton {
private View view;
private TextView textView;
private ImageView imageView;
public MyRadioButton(Context context) {
super(context);
init(context);
}
public MyRadioButton(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public MyRadioButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
public void setImageResource(int resId) {
imageView.setImageResource(resId);
redrawLayout();
}
public void setImageBitmap(Bitmap bitmap) {
imageView.setImageBitmap(bitmap);
redrawLayout();
}
// setText is a final method in ancestor, so we must take another name.
public void setTextWith(int resId) {
textView.setText(resId);
redrawLayout();
}
public void setTextWith(CharSequence text) {
textView.setText(text);
redrawLayout();
}
private void init(Context context) {
view = LayoutInflater.from(context).inflate(R.layout.my_radio_button_content, null);
textView = view.findViewById(R.id.textView);
imageView = view.findViewById(R.id.imageView);
redrawLayout();
}
private void redrawLayout() {
view.setDrawingCacheEnabled(true);
view.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
view.buildDrawingCache(true);
Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
setCompoundDrawablesWithIntrinsicBounds(new BitmapDrawable(getResources(), bitmap), null, null, null);
view.setDrawingCacheEnabled(false);
}
}
my_radio_button_content.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher_background" />
</LinearLayout>
[1。如果在项目中使用appcompat
,请在类顶部注释androidx
导入,并取消注释appcompat
一个。
2。您只需更改android:paddingLeft
的RadioButton
,即可更改自定义布局的位置:
<com.aminography.radiobutton.MyRadioButton
android:id="@+id/radioButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="8dp" />