生成海报分享bitmap图

最新推荐文章于 2024-05-08 02:24:33 发布

原创最新推荐文章于 2024-05-08 02:24:33 发布 · 534 阅读

CC 4.0 BY-SA版权

本文介绍了一种在安卓应用中实现将应用内的视图截图并分享至微信的方法。通过创建Bitmap对象，利用Canvas进行绘图，实现了对指定View的截图功能。此外，还提供了不同场景下（如滚动视图）的截图方案，并详细展示了如何将图片压缩并发送到微信。

bitmap = createBitmap(relativeLayout);
WXImageObject imgObj =new WXImageObject(bitmap);
//创建WXMediaMessage对象，并包装创建WXImageObject对象
WXMediaMessage msg =new WXMediaMessage();
msg.mediaObject= imgObj;
//压缩图像
Bitmap thumbBmp = Bitmap.createScaledBitmap(bitmap,120,150, true);
bitmap.recycle();
//释放图像所占用的内存资源
msg.thumbData= bmpToByteArray(thumbBmp, true);

SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = buildTransction("img");
        //发送的内容或者对象
        req.message = msg;
        req.scene = SendMessageToWX.Req.WXSceneSession;
        wxapi.sendReq(req);

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private Button btnCommon;
    private Button btnScroll;
    private Button btnInflate;
    private RelativeLayout container;
    private RelativeLayout llScroll;
    private ImageView imageView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnCommon = findViewById(R.id.btn_common);
        btnScroll = findViewById(R.id.btn_scroll);
        btnInflate = findViewById(R.id.btn_inflate);
        container = findViewById(R.id.container);
        llScroll = findViewById(R.id.ll_scroll);
        imageView = findViewById(R.id.img);
        btnCommon.setOnClickListener(this);
        btnScroll.setOnClickListener(this);
        btnInflate.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        Bitmap bitmap=null;
        switch (v.getId()) {
            case R.id.btn_common:
                bitmap = createBitmap(llScroll);
                imageView.setImageBitmap(bitmap);

                break;
            case R.id.btn_scroll:
                bitmap = createBitmap2(llScroll);
                imageView.setImageBitmap(bitmap);
                break;
            case R.id.btn_inflate:
                View view = LayoutInflater.from(this).inflate(R.layout.view_inflate, null, false);
                bitmap = createBitmap3(view, getScreenWidth(), getScreenHeight());
                break;
            default:
                break;
        }
        saveBitmap(bitmap);

    }


    private Bitmap createBitmap(View view) {
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();
        return bitmap;
    }

    public Bitmap createBitmap2(View v) {
        Bitmap bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(bitmap);
        c.drawColor(Color.WHITE);
        v.draw(c);
        return bitmap;
    }

    public Bitmap createBitmap3(View v, int width, int height) {
        //测量使得view指定大小
        int measuredWidth = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
        int measuredHeight = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
        v.measure(measuredWidth, measuredHeight);
        //调用layout方法布局后，可以得到view的尺寸大小
        v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
        Bitmap bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(bitmap);
        c.drawColor(Color.WHITE);
        v.draw(c);
        return bitmap;
    }

    private void saveBitmap(Bitmap bitmap) {
        FileOutputStream fos;
        try {
            File root = Environment.getExternalStorageDirectory();
            File file = new File(root, "test.png");
            fos = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.PNG, 90, fos);
            fos.flush();
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public int getScreenHeight() {
        return getResources().getDisplayMetrics().heightPixels;
    }

    public int getScreenWidth() {
        return getResources().getDisplayMetrics().widthPixels;
    }

    public void saveBitmapFile(Bitmap bitmap){
        File file=new File("/mnt/sdcard/pic/01.jpg");
        try {
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
            bos.flush();
            bos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}