android 打电话

btn= (Button) findViewById(R.id.btn_laopo);
btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Uri number = Uri.parse("tel:[phone]");
Intent intent = new Intent(Intent.ACTION_DIAL, number);
startActivity(intent);
}

});

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