Android---读取assets文件夹中的文件

本篇文章介绍如何读取assets文件夹中的内容，本事例中读取assets中的txt文本文件和图片文件，显示到屏幕上。

1.activity.xml文件只有一个TextView和一个ImageView

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.assetstest.MainActivity" >

    <TextView
        android:id="@+id/tv_txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>  
    <ImageView 
        android:id="@+id/iv_pic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/tv_txt"
        />
</RelativeLayout>

2.MainActivity.java文件

public class MainActivity extends Activity {

    private TextView tv_txt;
    private ImageView iv_pic;

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

        tv_txt = (TextView) findViewById(R.id.tv_txt);
        iv_pic = (ImageView) findViewById(R.id.iv_pic);

        loadTxt();
        loadImage();
    }

    private void loadTxt() {
        try {
            InputStream is = getAssets().open("dong.txt");
            int size = is.available(); // 得到文件大小
            byte[] buffer = new byte[size];
            is.read(buffer);
            is.close();
            tv_txt.setText(new String(buffer));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void loadImage() {
        try {
            InputStream is = getAssets().open("socket.png");
            Bitmap bitmap = BitmapFactory.decodeStream(is);
            iv_pic.setImageBitmap(bitmap);

            // 两种方式都可以
            // Drawable drawable = Drawable.createFromStream(is, null);
            // iv_pic.setImageDrawable(drawable);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

3.运行效果：

源码下载