package com.example.sos;import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//1:查找界面上我们关心的控件View button = findViewById(R.id.button1);//2:给按钮注册一个点击事件button.setOnClickListener((OnClickListener) new ButtonClickListener());}private class ButtonClickListener implements OnClickListener{//当按钮被点击时调用的方法public void onClick(View v) {//给110打电话Toast.makeText(MainActivity.this, "按钮被点击了", Toast.LENGTH_SHORT).show();}}@Overridepublic 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;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}
}

package com.example.sos;import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//1:查找界面上我们关心的控件View button = findViewById(R.id.button1);//2:给按钮注册一个点击事件button.setOnClickListener((OnClickListener) new ButtonClickListener());}private class ButtonClickListener implements OnClickListener{//当按钮被点击时调用的方法public void onClick(View v) {//给110打电话//Toast.makeText(MainActivity.this, "按钮被点击了", Toast.LENGTH_SHORT).show();Intent intent = new Intent();//创建意图//设置动作:拨打电话
            intent.setAction(Intent.ACTION_CALL);//设置数据  URI：统一资源定位符 tel://
            intent.setData(Uri.parse("tel://110"));startActivity(intent);}}@Overridepublic 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;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}
}