建立一个单击按钮，直接打电话实例

应该在程序清单文件AndroidManifest.xml中加入拨打电话的权限

<uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>

package com.example.wudi;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Intent;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button=(Button)findViewById(R.id.button);
button.setOnClickListener(
new OnClickListener(){
public void onClick(View v)
{
Uri uri=Uri.parse("tel:154515455"); //设置拨打的电话格式 tel:电话
Intent intent=new Intent(Intent.ACTION_CALL,uri);
startActivity(intent);
}

}
);

}

@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;
}

}