android 判断是否第一次进入欢迎页

package com.example.zsh.rememberpsw_test;import android.content.Intent;import android.content.SharedPreferences;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.widget.RelativeLayout;public class MainActivity extends AppCompatActivity {    private Intent intent;    private SharedPreferences pref;    //用于判断是否是第一次运行，运行后变为false    private boolean isFirst = true;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        RelativeLayout layoutWelcome = (RelativeLayout) findViewById(R.id.layoutwelcome);        AlphaAnimation alphaAnimation = new AlphaAnimation(0.1f, 1.0f);        alphaAnimation.setDuration(3000);        layoutWelcome.startAnimation(alphaAnimation);        alphaAnimation.setAnimationListener(new Animation.AnimationListener() {            @Override            public void onAnimationStart(Animation animation) {            }            @Override            public void onAnimationRepeat(Animation animation) {            }            @Override            public void onAnimationEnd(Animation animation) {                judgeIntent();            }            private void judgeIntent() {                pref = getSharedPreferences("isFirst", MODE_PRIVATE);//创建SharedPreferences对象                isFirst = pref.getBoolean("isFirstIn", true);//如果第一次运行，无isFirstIn值，自动获取第二个参数为默认值                if (isFirst) {//如果为true，进入if语句                    intent = new Intent(MainActivity.this, LoginActivity.class);                    SharedPreferences.Editor editor = pref.edit();                    editor.putBoolean("isFirstIn", false);//保存isFirstIn值为false                    editor.commit();//提交数据                } else {                    intent = new Intent(MainActivity.this, MainActivity.class);//如果为false，说明程序已经运行过，直接跳转到主页面                }                startActivity(intent);                finish();            }        });    }}
android 判断是否第一次进入欢迎页

android 判断是否第一次进入欢迎页

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