四种开启activity的方式

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/ITzhongzi/article/details/88419698

注意

• 显式跳转更加安全
• 在本应用内跳转都用显式跳转

示例代码

package com.example.www.activitydemo;

import android.Manifest;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        requestPermissions(new String[]{Manifest.permission.CALL_PHONE}, 200);
    }

    /*
    *
    * 调用打电话的 activity
    * */
    public void click(View v) {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_CALL);
        intent.setData(Uri.parse("tel:" + 183012));
        startActivity(intent);
    }
    /*
    *  隐式跳转
    * */
    public void click2(View v) {
        Intent intent = new Intent();
        intent.setAction("testActivity");

        startActivity(intent);
    }

    /*
    *
    * 显式跳转到 某个应用 的某个 activity下面
    * */
    public void click3(View v) {
        Intent intent = new Intent();
        intent.setClassName("com.example.www.activitydemo", "com.example.www.activitydemo.Test2Activity");

        startActivity(intent);
    }

    /*
    * 显式跳转到本应用下面的 某个 activity
    * */
    public void click4(View view) {
        Intent intent = new Intent();
        intent.setClass(getApplicationContext(), TestActivity.class);

        startActivity(intent);
    }


    /*
     * 显式跳转到本应用下面的 某个 activity
     * */
    public void click5(View view) {
        Intent intent = new Intent(getApplicationContext(), TestActivity.class);

        startActivity(intent);
    }


}