Android应用之更换头像

最新推荐文章于 2021-10-30 20:05:56 发布

原创最新推荐文章于 2021-10-30 20:05:56 发布 · 1.1k 阅读

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本文介绍了一个简单的图片切换器实现方案，通过自定义Adapter为Gallery组件填充数据，并利用AlertDialog展示图片选项，点击按钮后可以在不同图片间进行切换。

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先来看一下运行图：

下面看一下具体的代码：

MainActivity.java

package cn.bzu.dialog_imageswitcher;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;

import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageButton;
import android.widget.ImageView;

public class MainActivity extends Activity{

	private ImageButton imageButton;
	private Gallery gallery;
	private ImageView imageView;

	private Integer[] mThumbIds = {

	R.drawable.aa, R.drawable.bb,
			R.drawable.cc, R.drawable.dd,
			R.drawable.ee, R.drawable.ff,
			R.drawable.gg};

	private Integer[] mImageIds = {

			R.drawable.cc, R.drawable.dd,
			R.drawable.ee, R.drawable.ff,
			R.drawable.gg };

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		iniComponent();

		imageButton.setImageResource(R.drawable.cc);

		imageButton.setOnClickListener(new ImageButtonListener());
	}

	// 初始化组件
	private void iniComponent() {
		imageButton = (ImageButton) findViewById(R.id.imageButton);

	}

	
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

	// 创建适配器
	private class ImageAdapter extends BaseAdapter {

		private Context context;

		public ImageAdapter(Context c) {
			this.context = c;
		}

		public int getCount() {
			return mThumbIds.length;
		}

		public Object getItem(int position) {
			return position;
		}

		public long getItemId(int position) {
			return position;
		}

		// 获取视图
		public View getView(int position, View convertView, ViewGroup parent) {
			ImageView imageView = new ImageView(context);
			imageView.setImageResource(mThumbIds[position]);
			imageView.setAdjustViewBounds(true);
			imageView.setLayoutParams(new Gallery.LayoutParams(
					LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

			return imageView;
		}

	}

	private class ImageButtonListener implements
			android.view.View.OnClickListener {

		public void onClick(View v) {
			AlertDialog.Builder imageSelect = new AlertDialog.Builder(
					MainActivity.this);
			LayoutInflater layoutInflater = LayoutInflater
					.from(MainActivity.this);
			View galleryView = layoutInflater.inflate(
					R.layout.activity_gallery, null);
			gallery = (Gallery) galleryView.findViewById(R.id.gallery);
			gallery.setAdapter(new ImageAdapter(MainActivity.this));
			gallery.setOnItemClickListener(new ItemClickListener());
			
			imageSelect.setIcon(android.R.drawable.btn_star)
					.setView(galleryView).setTitle("头像选择")
					.setPositiveButton("确定", new OnClickListener() {

						public void onClick(DialogInterface dialog, int which) {

						}
					}).create().show();
		}

	}
	
	private class ItemClickListener implements OnItemClickListener{

		public void onItemClick(AdapterView<?> parent, View view, final int position,
				long id) {
			AlertDialog.Builder imageSelect = new AlertDialog.Builder(
					MainActivity.this);
			LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this);

			View layoutview = layoutInflater.inflate(R.layout.activity_image, null);
			imageView = (ImageView) layoutview.findViewById(R.id.imageView);
			imageView.setImageResource(mImageIds[position]);
			imageSelect.setView(layoutview)
					.setPositiveButton("确定", new OnClickListener() {

						public void onClick(DialogInterface dialog, int which) {

							imageButton.setImageResource(mThumbIds[position]);
						}

					}).create().show();
			
		}

		
	}
}

下面是布局文件：

activity_main.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:background="@drawable/gh"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="@dimen/padding_medium"
        android:text="@string/prompt"
        tools:context=".MainActivity" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="horizontal" >

        <ImageButton
            android:id="@+id/imageButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            android:contentDescription="@string/app_name"
            />

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="@string/info" >

            <requestFocus />
        </EditText>

    </LinearLayout>

</LinearLayout>

activity_gallery.xml：

<?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="match_parent"
    android:orientation="vertical" >
    <Gallery 
        android:id="@+id/gallery"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:spacing="2dp"
        />
</LinearLayout>

activity_image.xml：

<?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="match_parent"
    android:orientation="vertical" >
    <ImageView 
        android:id="@+id/imageView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:contentDescription="@string/app_name"
        />

</LinearLayout>

必要的需要在strings.xml中配置一下就OK了！