UI基础----基本控件的使用之ImageView

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ImageView是用于在界面上展示一些图片的一个控件，通过它可以让我们的程序变得更加丰富多彩,ImageView的基本属性与前面的控件是一样的，但ImageView通过android:src=”“可以展示图片，在代码中可以使用setImageResource()的方法获取图片

<?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">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical">        <ImageView        android:layout_width="match_parent"        android:layout_height="wrap_content"            android:tint="#ff00ff"        android:src="@mipmap/ooopic_1439859227"        />        <ImageView            android:id="@+id/image_pic"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:background="@mipmap/elephant"            android:scaleType="center"            android:src="@mipmap/dog"            />        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:orientation="horizontal">            <Button                android:id="@+id/button_alph_less"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="减少透明度"/>            <Button                android:id="@+id/button_alph_add"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="增加透明度"/>        </LinearLayout>        <ImageView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:scaleType="centerCrop"            android:src="@mipmap/ooopic_1439859227"            />        <ImageView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:scaleType="centerInside"            android:src="@mipmap/ooopic_1439859227"            />        <ImageView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:scaleType="fitCenter"            android:src="@mipmap/ooopic_1439859227"            />        <ImageView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:scaleType="fitEnd"            android:src="@mipmap/ooopic_1439859227"            />        <ImageView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:src="@mipmap/ooopic_1439859227"            android:scaleType="fitStart"            />        <ImageView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:src="@mipmap/ooopic_1439859227"            android:scaleType="fitXY"            />        <ImageView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:src="@mipmap/ooopic_1439859227"            android:scaleType="matrix"            />    </LinearLayout></ScrollView>

package com.test.shiweiwe.day821mytest;import android.annotation.TargetApi;import android.app.Activity;import android.os.Build;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ImageView;/** * Created by Administrator on 2015/8/24. */public class ImageActivity extends Activity implements View.OnClickListener{    private Button mButtonAdd;    private Button mButtonLess;    private ImageView mImageView;    private int malphaCount;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_image_view);        mButtonAdd= (Button) findViewById(R.id.button_alph_add);        mButtonLess= (Button) findViewById(R.id.button_alph_less);        mImageView= (ImageView) findViewById(R.id.image_pic);        mButtonLess.setOnClickListener(this);        mButtonAdd.setOnClickListener(this);    }    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)    @Override    public void onClick(View v) {        int code = Build.VERSION.SDK_INT;        if(v.getId()==R.id.button_alph_add){            malphaCount+=5;            if(code<16){                mImageView.setAlpha(malphaCount);            }else {                mImageView.setImageAlpha(malphaCount);            }        }else {            malphaCount-=5;            if(code<16){                mImageView.setAlpha(malphaCount);            }else {                mImageView.setImageAlpha(malphaCount);            }        }    }}

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