一、 MyApplication类的编写：
新建一个类MyApplication，继承自Application。代码如下：
MyApplication.java:
1 package com.smyhvae.homepicdemo;
2
3 import android.app.Application;
4 import android.os.Handler;
5 import android.os.Looper;
6
7 /**
8 * Created by smyhvae on 2015/5/13.
9 */
10 public class MyApplication extends Application {
11 //获取到主线程的上下文
12 private static MyApplication mContext = null;
13 //获取到主线程的handler
14 private static Handler mMainThreadHandler = null;
15 //获取到主线程的looper
16 private static Looper mMainThreadLooper = null;
17 //获取到主线程
18 private static Thread mMainThead = null;
19 //获取到主线程的id
20 private static int mMainTheadId;
21
22 @Override
23 public void onCreate() {
24 // TODO Auto-generated method stub
25 super.onCreate();
26 this.mContext = this;
27 this.mMainThreadHandler = new Handler();
28 this.mMainThreadLooper = getMainLooper();
29 this.mMainThead = Thread.currentThread();
30 //android.os.Process.myUid() 获取到用户id
31 //android.os.Process.myPid()获取到进程id
32 //android.os.Process.myTid()获取到调用线程的id
33 this.mMainTheadId = android.os.Process.myTid();
34 }
35
36 public static MyApplication getApplication() {
37 return mContext;
38 }
39
40 public static Handler getMainThreadHandler() {
41 return mMainThreadHandler;
42 }
43
44 public static Looper getMainThreadLooper() {
45 return mMainThreadLooper;
46 }
47
48 public static Thread getMainThread() {
49 return mMainThead;
50 }
51
52 public static int getMainThreadId() {
53 return mMainTheadId;
54 }
55
56 }
上面的所有代码每次在开发一个新的app时都需要用到的，然后具体到不同的项目，再继续添加不同的东西。
然后记得在清单文件中进行声明：
1 <application 2 android:allowBackup="true" 3 android:icon="@mipmap/ic_launcher" 4 android:label="@string/app_name" 5 android:theme="@style/AppTheme" 6 android:name=".MyApplication">
需要声明的是上方代码的第6行android:name的属性。
二、UI工具类的编写：
这个工具类也是在app开发中经常用到的。可以直接copy。代码如下：
UIUtils.java:
1 package com.smyhvae.homepicdemo.utils;
2
3 import android.content.Context;
4 import android.content.Intent;
5 import android.content.res.ColorStateList;
6 import android.content.res.Resources;
7 import android.graphics.drawable.Drawable;
8 import android.os.Handler;
9 import android.view.LayoutInflater;
10 import android.view.View;
11
12 import com.smyhvae.homepicdemo.MyApplication;
13
14 /**
15 * Created by smyhvae on 2015/5/13.
16 */
17
18 public class UIUtils {
19
20
21 public static Context getContext() {
22 return MyApplication.getApplication();
23 }
24
25 public static Thread getMainThread() {
26 return MyApplication.getMainThread();
27 }
28
29 public static long getMainThreadId() {
30 return MyApplication.getMainThreadId();
31 }
32
33 /** dip转换px */
34 public static int dip2px(int dip) {
35 final float scale = getContext().getResources().getDisplayMetrics().density;
36 return (int) (dip * scale + 0.5f);
37 }
38
39 /** pxz转换dip */
40 public static int px2dip(int px) {
41 final float scale = getContext().getResources().getDisplayMetrics().density;
42 return (int) (px / scale + 0.5f);
43 }
44
45 /** 获取主线程的handler */
46 public static Handler getHandler() {
47 return MyApplication.getMainThreadHandler();
48 }
49
50 /** 延时在主线程执行runnable */
51 public static boolean postDelayed(Runnable runnable, long delayMillis) {
52 return getHandler().postDelayed(runnable, delayMillis);
53 }
54
55 /** 在主线程执行runnable */
56 public static boolean post(Runnable runnable) {
57 return getHandler().post(runnable);
58 }
59
60 /** 从主线程looper里面移除runnable */
61 public static void removeCallbacks(Runnable runnable) {
62 getHandler().removeCallbacks(runnable);
63 }
64
65 public static View inflate(int resId){
66 return LayoutInflater.from(getContext()).inflate(resId,null);
67 }
68
69 /** 获取资源 */
70 public static Resources getResources() {
71
72 return getContext().getResources();
73 }
74
75 /** 获取文字 */
76 public static String getString(int resId) {
77 return getResources().getString(resId);
78 }
79
80 /** 获取文字数组 */
81 public static String[] getStringArray(int resId) {
82 return getResources().getStringArray(resId);
83 }
84
85 /** 获取dimen */
86 public static int getDimens(int resId) {
87 return getResources().getDimensionPixelSize(resId);
88 }
89
90 /** 获取drawable */
91 public static Drawable getDrawable(int resId) {
92 return getResources().getDrawable(resId);
93 }
94
95 /** 获取颜色 */
96 public static int getColor(int resId) {
97 return getResources().getColor(resId);
98 }
99
100 /** 获取颜色选择器 */
101 public static ColorStateList getColorStateList(int resId) {
102 return getResources().getColorStateList(resId);
103 }
104 //判断当前的线程是不是在主线程
105 public static boolean isRunInMainThread() {
106 return android.os.Process.myTid() == getMainThreadId();
107 }
108
109 public static void runInMainThread(Runnable runnable) {
110 if (isRunInMainThread()) {
111 runnable.run();
112 } else {
113 post(runnable);
114 }
115 }
116
117 public static void startActivity(Intent intent){
118 // BaseActivity activity = BaseActivity.getForegroundActivity();
119 // if(activity != null){
120 // activity.startActivity(intent);
121 // }else{
122 // intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
123 // getContext().startActivity(intent);
124 // }
125 }
126
127 /** 对toast的简易封装。线程安全，可以在非UI线程调用。 */
128 public static void showToastSafe(final int resId) {
129 showToastSafe(getString(resId));
130 }
131
132 /** 对toast的简易封装。线程安全，可以在非UI线程调用。 */
133 public static void showToastSafe(final String str) {
134 if (isRunInMainThread()) {
135 showToast(str);
136 } else {
137 post(new Runnable() {
138 @Override
139 public void run() {
140 showToast(str);
141 }
142 });
143 }
144 }
145
146 private static void showToast(String str) {
147 // BaseActivity frontActivity = BaseActivity.getForegroundActivity();
148 // if (frontActivity != null) {
149 // Toast.makeText(frontActivity, str, Toast.LENGTH_LONG).show();
150 // }
151 }
152 }
时间： 2024-11-02 04:35:36