Android 截取本地布局，作为海报分享到微信/朋友圈_android 长截图 海报

view到图片共三步：1.初始化布局；2.布局转bitmap；3.bitmap存本地

将当前展示的布局生成图片

	public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TextView textView = findViewById(R.id.name);
        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                catchScreen();
            }
        });
    }

    private void catchScreen() {
    // 1. 初始化布局：
        View decorView = this.getWindow().getDecorView();
        decorView.setDrawingCacheEnabled(true);
        decorView.buildDrawingCache();
//        decorView.measure(View.MeasureSpec.makeMeasureSpec(decorView.getWidth(), View.MeasureSpec.EXACTLY),
//                View.MeasureSpec.makeMeasureSpec(decorView.getHeight(), View.MeasureSpec.EXACTLY));
//        decorView.layout((int) decorView.getX(), (int) decorView.getY(), (int) decorView.getX() + decorView.getMeasuredWidth(), (int) decorView.getY() + decorView.getMeasuredHeight());
        createPicture(decorView);
    }
	// 2. 将布局转成bitmap
    private void createPicture(View view) {
        Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache(), 33, 91, 686, 938);
        view.setDrawingCacheEnabled(false);
        view.destroyDrawingCache();
        //3. 将bitmap存入本地
        String strPath = "/testSaveView/" + UUID.randomUUID().toString() + ".png";
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            File sdCardDir = Environment.getExternalStorageDirectory();
            FileOutputStream fos = null;
            try {
                File file = new File(sdCardDir, strPath);
                if (!file.getParentFile().exists()) {
                    file.getParentFile().mkdirs();
                }
                fos = new FileOutputStream(file);

                //当指定压缩格式为PNG时保存下来的图片显示正常
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
                Log.e("MainActivity", "图片生成：" + file.getAbsolutePath());
                fos.flush();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    fos.close();
                    if (!bitmap.isRecycled()) {
                        bitmap.recycle();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
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动态的xml布局，没有父布局

这种情况比较难处理，我的布局属于这种，但是这样加载的布局，容易显示不全，延迟操作，不能根本解决，数据无法更新，看代码吧！

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TextView textView = findViewById(R.id.beauty);
        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                saveImage();
            }
        });
    }
// 1. 初始化布局：
    private void saveImage() {
        LayoutInflater from = LayoutInflater.from(MyApplication.context);
        WindowManager manager = this.getWindowManager();
        DisplayMetrics outMetrics = new DisplayMetrics();
        manager.getDefaultDisplay().getMetrics(outMetrics);
        int width = outMetrics.widthPixels;
        int height = outMetrics.heightPixels;
        View viewById = from.inflate(R.layout.poster_layout, null);
        LinearLayout ll_poster = viewById.findViewById(R.id.ll_poster);
        viewById.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        viewById.layout(0, 0, viewById.getMeasuredWidth(), viewById.getMeasuredHeight());
        ImageView imageView = viewById.findViewById(R.id.im_head_portrait);
        imageView.setImageResource(R.mipmap.wx_default_male);
        TextView textView = viewById.findViewById(R.id.name);
        textView.setText("张三");
        WindowManager.LayoutParams params = new WindowManager.LayoutParams();
        params.width = width;
        params.height = height;
        params.gravity = Gravity.CENTER;
        ll_poster.setLayoutParams(params);
//        viewById.setLayoutParams(params);
//        manager.addView(viewById, params);
//        View viewById = findViewById(R.id.ll_poster);

        viewById.setDrawingCacheEnabled(true);
        viewById.buildDrawingCache();
        // 2. 将布局转成bitmap
        createPicture(viewById);
    }
    private void createPicture(View view) {
        Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
        view.setDrawingCacheEnabled(false);
        view.destroyDrawingCache();
        //3.bitmap存本地
        String strPath = "/testSaveView/" + UUID.randomUUID().toString() + ".png";
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            File sdCardDir = Environment.getExternalStorageDirectory();
            FileOutputStream fos = null;
            try {
                File file = new File(sdCardDir, strPath);
                if (!file.getParentFile().exists()) {
                    file.getParentFile().mkdirs();
                }
                fos = new FileOutputStream(file);

                //当指定压缩格式为PNG时保存下来的图片显示正常
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
                Log.e("MainActivity", "图片生成：" + file.getAbsolutePath());
                //当指定压缩格式为JPEG时保存下来的图片背景为黑色
//				 bitmap.compress(CompressFormat.JPEG, 100, fos);
                fos.flush();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    fos.close();
                    if (!bitmap.isRecycled()) {
                        bitmap.recycle();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}
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主要参考了这几篇文章：
android生成将布局生成海报保存并分享

Android 布局生成分享图片
Android笔记：将布局转换成图片

手写View实现

这样不会担心布局不全，数据赋不上，看代码

LinearLayout weexSharePoster = new LinearLayout(activity);
        weexSharePoster.setPadding(ScreenUtil.dip2px(16), ScreenUtil.dip2px(16), ScreenUtil.dip2px(21.5f), 0);
        weexSharePoster.setBackground(activity.getDrawable(R.drawable.weex_share_bg));
        weexSharePoster.setOrientation(LinearLayout.VERTICAL);
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之后就不断到添加各种view进去就好了，有个课表分享的，类似，可以参考一下
Android 合并生成分享图片（View截图）
终于搞定！
之后就直接拿file或者bitmap分享到微信就好了。

– 还遇到个问题，在手写view的时候，因为我们底层都是用px测量大小，所有dp2px，然后我把sp2px，发现文字大了好多，最后看源码发现，textview.setTextSize(float value);默认就是按照sp的模式定义的，底层自动转px，所以我们不需要操作。拿走不谢～～