Question

编辑：要问问＆＃34;为什么它在setOnClickListener＆＃34;中有效，但很快就找到了。 https://stackoverflow.com/a/21926714/6474462

旧：正在玩ObjectAnimator并注意到LinearLayout getHeight（）返回0，但是在setOnClickListener（点击后）内部确实返回了真值，这是如何工作的？

    public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final LinearLayout linearLayout = (LinearLayout) findViewById(R.id.main_linear);

        TextView textView1 = (TextView) findViewById(R.id.textview1);
        final TextView textView2 = (TextView) findViewById(R.id.textview2);

        int viewHeight1 = linearLayout.getHeight();
        textView1.setText("viewHeight1: " + viewHeight1);

        textView2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int viewHeight2 = linearLayout.getHeight();
                textView2.setText("viewHeight2: " + viewHeight2);
                }
            });
        }
    }

Answer 1

您需要在屏幕上的对象绘制后调用getHeight（）

@echo off

Linearlayout getHeight（）返回0但在setOnClickListener内返回true值

1 个答案: