Android打印框架Demo

最近在学习Android API相关知识，才后知后觉地发现Android带有原生的打印功能。参考了
http:///shuoit/20140625/340810.html网站资料，把官方的相应代码整理成了个Demo，

/**
 * 主页面
 * 
 * @description：
 * @author ldm
 * @date 2016-4-28 上午9:54:17
 */
public class MainActivity extends Activity implements OnClickListener {
    private Button bitmap_btn;
    private Button layout_btn;
    private Button html_btn;
    private Button off_screen_btn;

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

    private void initViews() {
        this.bitmap_btn = (Button) findViewById(.bitmap_btn);
        this.layout_btn = (Button) findViewById(.layout_btn);
        this.html_btn = (Button) findViewById(.html_btn);
        this.off_screen_btn = (Button) findViewById(.off_screen_btn);
        this.bitmap_btn.setOnClickListener(this);
        this.layout_btn.setOnClickListener(this);
        this.html_btn.setOnClickListener(this);
        this.off_screen_btn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case .bitmap_btn:
            startIntent(PrintBitmapActivity.class);
            break;
        case .layout_btn:
            startIntent(PrintLyaoutActivity.class);
            break;
        case .html_btn:
            startIntent(PrintHtmlActivity.class);
            break;
        case .off_screen_btn:
            startIntent(PrintHtmlOffScreenActivity.class);
            break;
        }
    }

    private void startIntent(Class<?> tagert) {
        Intent in = new Intent(this, tagert);
        startActivity(in);
    }
}

/**
 * Android图片打印
 * 
 * @description
 * @author ldm
 * @date 2016-4-27 
 */
public class PrintBitmapActivity extends Activity {
    private ImageView mImageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.print_bitmap);
        mImageView = (ImageView) findViewById(.image);
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == .menu_print) {
            print();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void print() {
        // // bitmap打印工具类。
        PrintHelper printHelper = new PrintHelper(this);

        /**
         * PrintHelper通过setScaleMode()方法设置模式，现在有两种模式
         * SCALE_MODE_FIT：这个打印完整的图片，这样打印纸的边缘可能有空白
         * SCALE_MODE_FILL：这个填满所有的打印纸，因此图片的边缘可能打印不出来
         */
        printHelper.setScaleMode(PrintHelper.SCALE_MODE_FIT);
        // 获取ImageView这个用于显示图片的控件里的图片
        Bitmap bitmap = ((BitmapDrawable) mImageView.getDrawable()).getBitmap();
        // 打印图片
        printHelper.printBitmap("Print Bitmap", bitmap);
    }
}