抖音找女友demo

在抖音无意中刷到了个找女朋友的搞笑视频，但是是web端写的，闲来无事写了移动端的

MainAcitivity.class

package com.tayh.buttontest;

import android.app.ActionBar;
import android.content.Context;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.KeyEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

import java.util.Random;

public class MainActivity extends AppCompatActivity {

    Button button;
    LinearLayout linear;
    Button rightbtn;
    private int screenWidth, screenHeight;//屏幕的宽度，高度
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
       getSupportActionBar().hide();
       initView();
    }
    private void initView(){
        WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        screenWidth = outMetrics.widthPixels;
        screenHeight = outMetrics.heightPixels;
        button = findViewById(R.id.test_btn);
        rightbtn = findViewById(R.id.right_btn);
        linear = findViewById(R.id.linear);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setPosition();
            }
        });
        rightbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(),"这就对了！",Toast.LENGTH_SHORT).show();
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        finish();
                    }
                }, 2000);
            }
        });
    }

    private void setPosition(){
        int viewWidth = button.getWidth();
        int viewHeight = button.getHeight();
        int x = getRandomInt(screenWidth - viewWidth)；
        int y =linear.getHeight()+ getRandomInt(screenHeight -linear.getHeight() - viewHeight);
        button.setX(x);
        button.setY(y);
    }

    private int getRandomInt(int max) {
        Random random = new Random();
        return random.nextInt(max);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK||keyCode ==KeyEvent.KEYCODE_HOME){
            Toast.makeText(this,"不点好，出不去哦~",Toast.LENGTH_SHORT).show();
            return true;
        }
            return super.onKeyDown(keyCode, event);
    }
}

layout布局

<?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">
    <LinearLayout
        android:id="@+id/linear"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:layout_marginTop="20dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:textColor="@color/colorAccent"
            android:layout_gravity="center_horizontal"
            android:text="观察你好久了，做我女朋友好不好？"/>
        <Button
            android:id="@+id/right_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:layout_gravity="center_horizontal"
            android:text="好"
            />

    </LinearLayout>
        <Button
            android:id="@+id/test_btn"
            android:layout_marginTop="30dp"
            android:layout_gravity="center_horizontal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="不好"
            />
</LinearLayout>

CD的部分说完了，说点技术上的
1.实现控件位置变化
linear.getHeight是获取不对按钮上方layout距离，这样可以保证随机点都在layout下面。setX，Y是控件位置变化

    private void setPosition(){
        int viewWidth = button.getWidth();
        int viewHeight = button.getHeight();
        int x = getRandomInt(screenWidth - viewWidth)；
        int y =linear.getHeight()+ getRandomInt(screenHeight -linear.getHeight() - viewHeight);
        button.setX(x);
        button.setY(y);
    }

2.这个demo有个bug就是点击Home键也会回到桌面，Back键监听比较简单onKeyDown可以解决，但是Home键不行。网上有很多方法，我也最后没有解决方案，也许是framework层才能搞定，需要大神点播。
但是实现了可以通过系统动态广播监听到home按键，但是不能控制不返回桌面。
HomeWatcherReceiver.class

package com.tayh.buttontest;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class HomeWatcherReceiver extends BroadcastReceiver {

    private static final String LOG_TAG = "HomeReceiver";
    private static final String SYSTEM_DIALOG_REASON_KEY = "reason";
    private static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
    private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
    private static final String SYSTEM_DIALOG_REASON_LOCK = "lock";
    private static final String SYSTEM_DIALOG_REASON_ASSIST = "assist";

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        Log.i(LOG_TAG, "onReceive: action: " + action);
        if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
            // android.intent.action.CLOSE_SYSTEM_DIALOGS
            String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
            Log.i(LOG_TAG, "reason: " + reason);

            if (SYSTEM_DIALOG_REASON_HOME_KEY.equals(reason)) {
                // 短按Home键
                Log.i(LOG_TAG, "homekey");

            }
            else if (SYSTEM_DIALOG_REASON_RECENT_APPS.equals(reason)) {
                // 长按Home键 或者 activity切换键
                Log.i(LOG_TAG, "long press home key or activity switch");

            }
            else if (SYSTEM_DIALOG_REASON_LOCK.equals(reason)) {
                // 锁屏
                Log.i(LOG_TAG, "lock");
            }
            else if (SYSTEM_DIALOG_REASON_ASSIST.equals(reason)) {
                // samsung 长按Home键
                Log.i(LOG_TAG, "assist");
            }
        }
    }
}

在mainAcitity里注册广播

    private static void registerHomeKeyReceiver(Context context) {
        Log.i("test", "registerHomeKeyReceiver");
        mHomeKeyReceiver = new HomeWatcherReceiver();
        final IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);

        context.registerReceiver(mHomeKeyReceiver, homeFilter);
    }

    private static void unregisterHomeKeyReceiver(Context context) {
        Log.i("test", "unregisterHomeKeyReceiver");
        if (null != mHomeKeyReceiver) {
            context.unregisterReceiver(mHomeKeyReceiver);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        registerHomeKeyReceiver(this);
    }

    @Override
    protected void onStop() {
        super.onStop();
        unregisterHomeKeyReceiver(this);
    }