如何通过学习Activity深入理解Android开发中的长尾词应用？

本文共计386个文字，预计阅读时间需要2分钟。

javapackage com.test.activitytest;

import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;

public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button=findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(MainActivity.this, SecondActivity.class); startActivity(intent); } }); }}

MainActivity.java

package com.test.activitytest; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { final String tag="tag"; private Button tb; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout); tb = (Button) findViewById(R.id.button); tb.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this,secActivity.class); MainActivity.this.startActivity(intent); } }); Log.i(tag,"Activity is onCreate"); } protected void onStart(){ super.onStart(); Log.i(tag,"Activity is onStart"); } protected void onResume(){ super.onResume(); Log.i(tag,"Activity is onResume"); } protected void onPause(){ super.onPause(); Log.i(tag,"Activity is onPause"); } protected void onStop(){ super.onStop(); Log.i(tag,"Activity is onStop"); } protected void onDestory(){ super.onDestroy(); Log.i(tag,"Activity is onDestory"); } protected void onRestart(){ super.onRestart(); Log.i(tag,"Activity is onRestart"); } } secActivity.java

package com.test.activitytest; import android.app.Activity; import android.os.Bundle; import android.support.annotation.Nullable; /** * Created by Administrator on 2017/8/28. */ public class secActivity extends Activity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.seclayout); } } layout.xml

seclayout.xml

AndroidManifest.xml