android中动态修改ImageView控件的宽高度
本例实现了动态修改ImageView控件的宽高度,有两个按钮,一个按钮实现放大image,一个按钮实现缩小image
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout 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" tools:context=".MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="60dp" android:gravity="center" android:orientation="horizontal"> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="放大" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="缩小" /> </LinearLayout> <ImageView android:id="@+id/imageView" android:layout_width="150dp" android:layout_height="150dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:srcCompat="@drawable/img01" /> </android.support.constraint.ConstraintLayout>
MainActivity.java
package com.example.chenrui.app1; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final ImageView image = findViewById(R.id.imageView); Button button1 = findViewById(R.id.button1); button1.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { ViewGroup.LayoutParams params = image.getLayoutParams(); params.width = params.width + 50; params.height = params.height + 50; image.setLayoutParams(params); } }); Button button2 = findViewById(R.id.button2); button2.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { ViewGroup.LayoutParams params = image.getLayoutParams(); params.width = params.width - 50; params.height = params.height - 50; image.setLayoutParams(params); } }); } }
实现的效果: