71，字节跳动历年校招Android面试真题解析

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
gv_home = (GridView) findViewById(R.id.gv_home);
gv_home.setAdapter(new HomeAdapter());
//监听gridview点击事件
gv_home.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
switch(position){
case 8:
//设置中心
startActivity(new Intent(HomeActivity.this, SettingActivity.class));
break;
default:
break;
}
}
});
}
GrideView的使用
首先创建布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=“http://schemas.android.com/apk/res/android”
android:layout_width=“match_parent”
android:layout_height=“match_parent”
android:orientation=“vertical” >
<TextView
style=“@style/TitleStyle”
android:text=“手机管家”
/>
<com.ldw.safe.view.FocusedTextView
android:layout_width=“match_parent”
android:layout_height=“wrap_content”
android:textColor=“@color/black”
android:text=“简书是一个优质的创作社区,在这里,你可以任性地创作,一篇短文、一张照片、一首诗、一幅画……我们相信,每个人都是生活中的艺术家,有着无穷的创造力”
android:singleLine=“true”
android:ellipsize=“marquee”
android:layout_marginTop=“3dp”
android:layout_marginBottom=“3dp”
android:textSize=“18sp”
/>
<GridView
android:id=“@+id/gv_home”
android:layout_width=“match_parent”
android:layout_height=“0dp”
android:layout_weight=“1”
android:verticalSpacing=“10dp”
android:numColumns=“3”
GrideView的单个条目
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=“http://schemas.android.com/apk/res/android”
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
android:gravity=“center”
android:orientation=“vertical” >
<ImageView
android:id=“@+id/iv_item”
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
android:src=“@drawable/app”
/>
<TextView
android:id=“@+id/tv_item”
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
android:text=“手机卫士”
android:textColor=“@color/black”
android:layout_marginTop=“5dp”
android:textSize=“18sp”
/>
逻辑代码，将单个条目逐一填充在GrideView中
package com.ldw.safe.Activity;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.ldw.safe.R;
import com.ldw.safe.utils.MD5Utils;
public class HomeActivity extends Activity{
private GridView gv_home;
private String[] mItems = new String[] {“手机防盗”, “通讯卫士”, “软件管理”, “进程管理”, “流量统计”, “手机杀毒”, “缓存清理”, “高级工具”, “设置中心”};
private int[] mPics = new int[] {R.drawable.safe, R.drawable.callmsgsafe, R.drawable.app,
R.drawable.taskmanager, R.drawable.netmanager, R.drawable.sysoptimize,
R.drawable.trojan, R.drawable.atools, R.drawable.settings};
private SharedPreferences mPref;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
mPref = getSharedPreferences(“config”, MODE_PRIVATE);
gv_home = (GridView) findViewById(R.id.gv_home);
gv_home.setAdapter(new HomeAdapter());
//监听gridview点击事件
gv_home.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
switch(position){
case 0:
//手机防盗
showPasswordDialog();
break;
case 1:
//通讯卫士
startActivity(new Intent(HomeActivity.this, CallSafeActivity.class));
break;
case 2:
//软件管理
startActivity(new Intent(HomeActivity.this, AppManagerActivity.class));
break;
case 3:
//进程管理
startActivity(new Intent(HomeActivity.this, TaskManagerActivity.class));
break;
case 5:
//手机杀毒
startActivity(new Intent(HomeActivity.this, AntivirusActivity.class));
break;
case 7:
//高级工具
startActivity(new Intent(HomeActivity.this, AdvancedToolsActivity.class));
break;
case 8:
//设置中心
startActivity(new Intent(HomeActivity.this, SettingActivity.class));
break;
default:
break;
}
}
});
}