【android】加载assets中的资源

There are times when you probably want to your application distribution with raw resources, instead of pre-defined resources, the ‘res‘ folder, you gonna have to make use of ‘Asset‘.

‘Assets’ folder will be distributed along with the APK, which contains all the raw files you need for application, such as:text files (.txt), non-Android XML files (.xml), Audio files (.wav, .mp3, .mid)…; those cannot be put into ‘res‘ folder as usual.

Thing needed to be looked up here:AssetManager from Android Developers’ References

This class does the job that we need.

First, create a project as usual, then put files into ‘asset‘ :

Now, create a simple layout containing aTextViewfor displaying the content of ‘text.txt‘ and anImageViewfor displaying the image ‘avatar.jpg’, which are put in Asset.

The implementation quite easy usingAssetManageras mentioned above.

package pete.android.study; import java.io.IOException;import java.io.InputStream; import android.app.Activity;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.widget.ImageView;import android.widget.TextView; public class Main extends Activity {     ImageView mImage;    TextView mText;     @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);         mImage = (ImageView)findViewById(R.id.image);        mText = (TextView)findViewById(R.id.text);        loadDataFromAsset();    }     public void loadDataFromAsset() {        // load text        try {            // get input stream for text            InputStream is = getAssets().open("text.txt");            // check size            int size = is.available();            // create buffer for IO            byte[] buffer = new byte[size];            // get data to buffer            is.read(buffer);            // close stream            is.close();            // set result to TextView            mText.setText(new String(buffer));        }        catch (IOException ex) {            return;        }         // load image        try {            // get input stream            InputStream ims = getAssets().open("avatar.jpg");            // load image as Drawable            Drawable d = Drawable.createFromStream(ims, null);            // set image to ImageView            mImage.setImageDrawable(d);        }        catch(IOException ex) {            return;        }     }}

That’s a quick sample code giving this result.

The distributed APK file contains the folder ‘assets‘, you might wanna check by opening it.

Quite easy, isn’t it?

@p/s: you can load image from Asset intoBitmapby usingBitmapFactory.decodeStream(), instead of using Drawable.

Have fun w/ Android Coding

原文链接：https://xjaphx.wordpress.com/2011/10/02/store-and-use-files-in-assets/

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