android performClick使用

performClick 是使用代码主动去调用控件的点击事件（模拟人手去触摸控件） -----------------------------------------

boolean android.view.View.performClick()

Call this view's OnClickListener, if it is defined.

Returns: True there was an assigned OnClickListener that was called, false otherwise is returned. --------------------------------------------- @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_my); btn1 = (Button) findViewById(R.id.button1); tv1 = (TextView) findViewById(R.id.textView1); btn1.performClick(); btn1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { tv1.setText("已经被点击过了"); } }); } 上述方式写，tv1的文字就是默认文字，仅仅有把setOnClickListener的声明写在performClick后面，直接执行程序才干显示“已被点击过了”

转载于:https://www.cnblogs.com/gcczhongduan/p/4242239.html

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