Android 簡單案例：onSaveInstanceState 和 onRestoreInstanceState

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import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;public final class MultiRes extends Activity {    private int mCurrentPhotoIndex = 0;    private int[] mPhotoIds = new int[] { R.drawable.sample_0,            R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3,            R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6,            R.drawable.sample_7 };    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        showPhoto(mCurrentPhotoIndex);        // Handle clicks on the ‘Next‘ button.        Button nextButton = (Button) findViewById(R.id.next_button);        nextButton.setOnClickListener(new View.OnClickListener() {            public void onClick(View v) {                mCurrentPhotoIndex = (mCurrentPhotoIndex + 1)                        % mPhotoIds.length;                showPhoto(mCurrentPhotoIndex);            }        });    }    @Override    protected void onSaveInstanceState(Bundle outState) {        outState.putInt("photo_index", mCurrentPhotoIndex);        super.onSaveInstanceState(outState);    }    @Override    protected void onRestoreInstanceState(Bundle savedInstanceState) {        mCurrentPhotoIndex = savedInstanceState.getInt("photo_index");        showPhoto(mCurrentPhotoIndex);        super.onRestoreInstanceState(savedInstanceState);    }    private void showPhoto(int photoIndex) {        ImageView imageView = (ImageView) findViewById(R.id.image_view);        imageView.setImageResource(mPhotoIds[photoIndex]);        TextView statusText = (TextView) findViewById(R.id.status_text);        statusText.setText(String.format("%d/%d", photoIndex + 1,                mPhotoIds.length));    }}

 

Android 簡單案例：onSaveInstanceState 和 onRestoreInstanceState