Intent intent_intent = new Intent(MainActivity.this,IntentActivity.class);

                startActivity(intent_intent);

public void onClick(View v) {
    Intent intent = new Intent();
    Intent intent2 = new Intent(IntentActivity.this,IntentRecieveActivity.class);
    switch (v.getId()){

        case R.id.btn_forresult:
            //开启视图，并携带code，等待返回数据
            startActivityForResult(intent2,0x60);
            break;
        case R.id.btn_tel: //打电话
            intent.setAction(Intent.ACTION_DIAL);
            intent.setData(Uri.parse("tel:5656565"));
            startActivity(intent);
            break;
        case R.id.btn_sms://发短信
            intent.setAction(Intent.ACTION_SENDTO);
            intent.setData(Uri.parse("smsto:"+10086));
            intent.putExtra("sms_body","welcome to andriod");
            startActivity(intent);
            break;
        case R.id.btn_view://跳转url页面
            intent.setAction(Intent.ACTION_VIEW);
            intent.setData(Uri.parse("https://blog.csdn.net/yangshuangyue/article/details/51910083"));
            startActivity(intent);
            break;
        case R.id.btn_com: //组件名称跳转
            intent.setClassName("com.qp.fragmenttest","com.qp.fragmenttest.ViewPageActivity");
            startActivity(intent);

            break;
        case R.id.btn_cat://categroy：初始化，关闭跳转主屏幕
            intent.setAction(Intent.ACTION_MAIN);
            intent.addCategory(Intent.CATEGORY_HOME);
            startActivity(intent);
            break;
        case R.id.btn_flag: //标志，不带历史纪录
            intent2.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
            startActivity(intent2);
            break;
        case R.id.btn_bigpic:
            intent.setAction(Intent.ACTION_VIEW);
            startActivity(intent);
            break;
        default:
            break;

    }
}

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

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

 <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>