我有一个带有textView和Button的应用程序,当调用onCreate时,我调用textView.getHeight()并返回的值为0.(在onResume和onPostResume中也尝试了这一点。)
当用户点击按钮时,它再次调用textView.getHeight(),现在我得到的答案是864而不是0。 为什么会这样?
(布局只有TextView和Button - 父级是RelativeLayout)
编辑:TextView在xml中有:android:layout_height =" match_parent" (父级是RelativeLayout,布局的基本父视图),因此真正的高度必须是> 0
代码:
TextView text;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (AutoScrollingText) findViewById(R.id.text);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(this);
Toast.makeText(this, "text height: " + text.getHeight(), Toast.LENGTH_SHORT).show();
}
@Override
protected void onPostResume() {
super.onPostResume();
Toast.makeText(this, "text height: " + text.getHeight(), Toast.LENGTH_SHORT).show();
}
@Override
public void onClick(View view) {
switch(view.getId()){
case (R.id.button) : {
Toast.makeText(this, "text height: " + text.getHeight(), Toast.LENGTH_SHORT).show();
}
}
}
答案 0 :(得分:0)
使用此
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (AutoScrollingText) findViewById(R.id.text);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(this);
text.post( new Runnuble(){
Toast.makeText(this, "text height: " + text.getHeight(), Toast.LENGTH_SHORT).show();
});
}
应该有效