Question

我想每秒更改coordinatorLayout的背景颜色但是，我发现，颜色coordinatorLayout从初始颜色RED变为直接最后一种颜色，即#09FF00数组中的COLORS。尽管中间颜色已记录在LogCat中，但中间颜色不会显示在布局中我做错了什么？

public class ColorActivity extends AppCompatActivity {

private static String COLORS [] = {"#FF0000", "#0000FF", "#09FF00"};

@Override
protected void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detect);

    final CoordinatorLayout coordinatorLayout = (CoordinatorLayout) findViewById(R.id.fullscreenview);
    coordinatorLayout.setBackgroundColor(Color.RED);

    new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                Thread.sleep(1000);
            }catch (Exception e) {
                e.printStackTrace();
            }
            changeColor(coordinatorLayout);
        }
    }).start();

}

private void changeColor(final CoordinatorLayout coordinatorLayout) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            for (String color: COLORS) {
                Log.i("COLOR", color);
                coordinatorLayout.setBackgroundColor(Color.parseColor(color));
            }
        }
    });
}

}

Answer 1

实际上代码中存在逻辑上的问题

for (String color: COLORS) {
                Log.i("COLOR", color);
                coordinatorLayout.setBackgroundColor(Color.parseColor(color));
            }

循环执行得如此之快，你将无法实现中间色。我建议改变

    new Thread(new Runnable() {
            @Override
            public void run() {
                 int colorIndex = 0;
                do{
                try {
                    changeColor(coordinatorLayout,COLORS[colorIndex++]);
                    Thread.sleep(100);
                }catch (Exception e) {
                    e.printStackTrace();
                }
               }while(iteration < COLORS.length)   
            }
        }).start();


    private void changeColor(final CoordinatorLayout coordinatorLayout,final String color) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
                Log.i("COLOR", color);
             coordinatorLayout.setBackgroundColor(Color.parseColor(color));
        }
    });
}

Answer 2

如果您的计时器逻辑每秒触发一次，那么在调用changeColor之前从COLORS获得单色，然后使用它。

喜欢这个......

    new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                Thread.sleep(1000);
            }catch (Exception e) {
                e.printStackTrace();
            }
            //get single color here
            //update color and pass it
            changeColor(coordinatorLayout, color);
        }
    }).start();


    private void changeColor(final CoordinatorLayout coordinatorLayout, color mcolor) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
                Log.i("COLOR", mcolor);
                coordinatorLayout.setBackgroundColor(Color.parseColor(mcolor));

        }
    });
}

Android - 动态更改布局的背景颜色

2 个答案: