为折叠工具栏中的TextView和ImageView设置对比度颜色

Question

我在Collapsing Toolbar中有一个ImageView和TextView。图像将从服务器动态加载。问题是，当我设置TextView的颜色（白色或黑色）时，它与图像的颜色有矛盾。作为一个初学者，我不知道如何解决它。有人能帮我吗？

公告活动

public class AnnouncementDetailsActivity extends AppCompatActivity {

    private TextView mTitle;
    private TextView mDescription;
    private ImageView image;
    private ProgressDialog progressDialog;
    private String mAnnouncementTitle;
    private String mAnnouncementDescription;
    private String mAnnounceImage;

    public GetAnnouncementTask mGetAnnouncement = null;
    private String DateString = DateFormat.getDateInstance(DateFormat.SHORT).format(Calendar.getInstance().getTime());
    private static final String TAG = "AnnouncementDetailsActivity";
    public static final String TAG_ANNOUNCEMENT_LIST_FRAGMENT = "announcement_list_fragment";
    private CollapsingToolbarLayout collapsingToolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.rgb(38, 55, 98));
        }
        setContentView(R.layout.activity_announcement_details);
        mTitle = (TextView) findViewById(R.id.announcement_title);
        mDescription = (TextView) findViewById(R.id.description);
        image = (ImageView) findViewById(R.id.announcement_image);

        collapsingToolbar = (CollapsingToolbarLayout) findViewById(R.id.detail_collapse_toolbar);
        collapsingToolbar.setTitle(mAnnouncementTitle);
//
//        collapsingToolbar.setCollapsedTitleTextColor(getResources().getColor(android.R.color.black));
        collapsingToolbar.setExpandedTitleColor(getResources().getColor(android.R.color.black));
        setSupportActionBar((Toolbar) findViewById(R.id.detail_announcement_toolbar));
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowTitleEnabled(false);
        Intent intent = getIntent();

        if (null != intent) {
            mAnnouncementTitle = intent.getStringExtra("announceTitle");
            mAnnouncementDescription = intent.getStringExtra("announceDescription");
            mAnnounceImage = intent.getStringExtra("announceImage");
            mTitle.setText(mAnnouncementTitle);
            mDescription.setText(mAnnouncementDescription);
            new GetAnnouncementTask(image)
                    .execute(mAnnounceImage);
        }
    }

    public class GetAnnouncementTask extends AsyncTask<String, Void, Bitmap> {

        ImageView image;
        public GetAnnouncementTask(ImageView bmImage) {
            this.image = bmImage;
        }
        @Override
        protected void onPreExecute() {
            super.onPreExecute();

        }
        protected Bitmap doInBackground(String... urls) {
            String url = urls[0];
            Bitmap mIcon = null;
            try {
                InputStream in = new java.net.URL(url.replaceAll(" ", "%20")).openStream();
                mIcon = BitmapFactory.decodeStream(in);
            } catch (Exception e) {
                Log.e("Error", e.getMessage());
            }
            return mIcon;
        }
        protected void onPostExecute(Bitmap result) {
            image.setImageBitmap(result);
        }

    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
    }
    public boolean onOptionsItemSelected(MenuItem item) {
        onBackPressed();
        return true;
    }
}

Answer 1

您可以根据图像的颜色（哪个图像在文本的背景中）更改TextView的颜色。Android中有Palette和Swatch，请查看此处和此处了解教程