Andriod4.3之button相应点击事件

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这个比较简单，在onCreate里相应就行了：

package com.example.helloworld;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.widget.TextView;import android.widget.Button; import android.widget.CheckBox; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.RadioGroup.OnCheckedChangeListener; import android.widget.Toast; import android.widget.ToggleButton; public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                Button btnOpen = (Button)findViewById(R.id.btnOpen);                btnOpen.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubDisplayToast("You have clicked the open button");}});    }private void DisplayToast(String str) {// TODO Auto-generated method stub Toast.makeText(this, str, Toast.LENGTH_SHORT).show();}    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    }