java 将按钮高度和宽度设置为换行内容并填充父级
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Set button height and width as wrap content and fill parent
提问by SweSnow
I'm developing a application where the user is supposed to be able to alter the apperence of a button by pressing other buttons. I use four buttons to set height as wrap content, height as fill parent, width as wrap content and width as fill parent.
我正在开发一个应用程序，用户应该能够通过按下其他按钮来改变按钮的外观。我使用四个按钮将高度设置为环绕内容，高度设置为填充父级，宽度设置为环绕内容，宽度设置为填充父级。
I googled a bit and found a solution using LayoutParams although that code didn't specify if height of width was alterd. I also got errors saying my IDE couldn't recognise "LayoutParams". What is the best way to do this?
我用谷歌搜索了一下，找到了一个使用 LayoutParams 的解决方案，尽管该代码没有指定宽度的高度是否改变。我还收到错误消息，说我的 IDE 无法识别“LayoutParams”。做这个的最好方式是什么？
回答by Pavel Dudka
What you need to look for - is View.ViewGroup.LayoutParams. Every LayoutParams has constant value for MATCH_PARENT and WRAP_CONTENT attributes. I have prepared simple code sample you can play with:
您需要寻找的是 View.ViewGroup.LayoutParams。每个 LayoutParams 都具有 MATCH_PARENT 和 WRAP_CONTENT 属性的常量值。我准备了简单的代码示例，您可以使用：
Activity:
活动：
package com.example.stack2;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener{
Button test;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button b = (Button)findViewById(R.id.button1);
b.setOnClickListener(this);
b = (Button)findViewById(R.id.button2);
b.setOnClickListener(this);
b = (Button)findViewById(R.id.button3);
b.setOnClickListener(this);
b = (Button)findViewById(R.id.button4);
b.setOnClickListener(this);
test = (Button)findViewById(R.id.test);
}
public void onClick(View v)
{
LayoutParams lp = test.getLayoutParams();
if(v.getId() == R.id.button1)
{
lp.height = LayoutParams.WRAP_CONTENT;
}else if(v.getId() == R.id.button2){
lp.width = LayoutParams.WRAP_CONTENT;
}else if(v.getId() == R.id.button3){
lp.height = LayoutParams.MATCH_PARENT;
}else if(v.getId() == R.id.button4){
lp.width = LayoutParams.MATCH_PARENT;
}
test.setLayoutParams(lp);
}
}
Layout xml:
布局xml：
<LinearLayout 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:orientation="vertical" >
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="horizontal">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="h_wc" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="w_wc" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="h_fp" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="h_fp" />
</LinearLayout>
<Button
android:id="@+id/test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="test" />
</LinearLayout>
回答by moDev
By using the below code you can easily alter the height and width dynamically.
通过使用以下代码，您可以轻松地动态更改高度和宽度。
btn = new Button(Activity.this);
btn.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
btn.setText("\t\t" + lbl + "\t\t\t ");
btn.setBackgroundResource(R.drawable.blue_button);
btn.setwidth(100);
