Android(安卓)自定义View - 网络加载 ProgressBar 加载与隐藏 - android

在Android App 开发中需要进行频繁的网络访问，在不同的业务逻辑以及页面中需要频繁的生成 ProgressBar 来进行调用与展示，想想就是一件麻烦的事情…

来一波图：

start

show

hide

SO  我们需要做的是：1.创建一个BaseActivity让之后的Activity继承此Activity2.自定义一个简单的View用于显示我们需要的ProgressBar 3.将自定义View 加载到BaseActivity中设置显示与隐藏方法4.进行简单的网络访问

step 1: 创建BaseActivity

package com.key.blog.base;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;/** * created by key  on 2019/5/16 */public abstract class BaseActivity extends AppCompatActivity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        initView();        initData();    }            public abstract void initView();    public abstract void initData();}

emmm… 新建一个抽象类BaseActivity 定义两个抽象方法将页面加载以及数据展示交由子类处理。

step2: 自定义View

1）.引用一个第三方ProgressBar库，项目地址添加链接描述

implementation 'me.zhanghai.android.materialprogressbar:library:1.4.2'

自定义BGProgressBar类

package com.key.blog.widget;import android.content.Context;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;import android.widget.LinearLayout;import com.key.blog.R;import me.zhanghai.android.materialprogressbar.MaterialProgressBar;/** * created by key  on 2019/5/16 */public class BGProgressBar extends LinearLayout {    private Context context;    private AttributeSet attrs;    private int defStyleAttr;    private MaterialProgressBar materialProgressBar;    public BGProgressBar(Context context) {        super(context);        this.context = context;        init();    }    public BGProgressBar(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        this.context = context;        this.attrs = attrs;        init();    }    public BGProgressBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        this.context = context;        this.attrs = attrs;        this.defStyleAttr = defStyleAttr;        init();    }    public void init(){        View inflate = inflate(context, R.layout.item_progress_bar, this);        materialProgressBar = inflate.findViewById(R.id.dynamic_progress);    }}

自定义View继承自LinearLayout 重写3个构造方法并加载布局

3）自定义BGProgressBar布局文件

item_progress_bar.xml

<?xml version="1.0" encoding="utf-8"?>

资源文件

color.xml

<?xml version="1.0" encoding="utf-8"?>    #008577    #00574B    #D81B60    #99000000    #00FFFFFF

drawable文件下的 progress_bar_bg.xml

<?xml version="1.0" encoding="utf-8"?>

自定义View的布局文件在根布局中设置宽高充满整个布局，并将其居中显示

step3: 将自定义View绑定到BaseActivity

package com.key.blog.base;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.view.ViewGroup;import com.key.blog.widget.BGProgressBar;/** * created by key  on 2019/5/16 */public abstract class BaseActivity extends AppCompatActivity {    private BGProgressBar mBGProgressBar;    private ViewGroup mRoot;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        initView();        initData();    }    @Override    protected void onStart() {        super.onStart();    }    @Override    protected void onResume() {        super.onResume();        mBGProgressBar = new BGProgressBar(this);        mRoot = findViewById(android.R.id.content);        mRoot.addView(mBGProgressBar);        hide();    }    public abstract void initView();    public abstract void initData();        protected void show(){        if( mBGProgressBar != null){           if(mBGProgressBar.getVisibility() != View.VISIBLE){                mBGProgressBar.setVisibility(View.VISIBLE);            }        }    }    protected void hide(){        if( mBGProgressBar != null){            mBGProgressBar.setVisibility(View.GONE);        }    }}

在onResume方法中生成控件并添加到根布局中设置初始状态为隐藏状态
step4: try

创建一个Activity 继承 BaseActivity 并发起网络请求，请求用OKHttp 哦！！！！！！

OKHttp项目地址添加链接描述

    implementation 'com.squareup.okhttp3:okhttp:3.12.1'    implementation 'com.squareup.okio:okio:2.1.0'

package com.key.blog.page;import android.annotation.SuppressLint;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import android.widget.TextView;import com.key.blog.R;import com.key.blog.base.BaseActivity;import java.io.IOException;import okhttp3.Call;import okhttp3.Callback;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;public class MainActivity extends BaseActivity {    private Button try_bt;    private TextView try_result;    @SuppressLint("HandlerLeak")    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            switch (msg.what){                case 0:                    loadError();                    break;                case 1:                    loadData();                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }    @Override    public void initView() {        setContentView(R.layout.activity_main);        try_bt = findViewById(R.id.try_bt);        try_result = findViewById(R.id.try_result);        try_bt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                connectBaidu();            }        });    }    @Override    public void initData() {    }    private void connectBaidu() {        show();        OkHttpClient okHttpClient = new OkHttpClient();        Request request = new Request.Builder().url("https://www.baidu.com").build();        Call call = okHttpClient.newCall(request);        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                handler.sendEmptyMessage(0);            }            @Override            public void onResponse(Call call, Response response) throws IOException {                handler.sendEmptyMessageDelayed(1,2000);            }        });    }    private void loadError() {        hide();        try_result.setText("FAIL");    }    private void loadData() {        hide();        try_result.setText("SUCCESS");    }}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

国际惯例访问通过okhttp访问百度，延迟两秒放送消息给主线程，我们只需要在显示的地方调用show(),需要隐藏的地方调用hide().

打完睡觉。。。。。。兄弟们，轻喷。我只是一个刚毕业的菜鸟！！！！！
欢迎指出错误。

Android(安卓)自定义View - 网络加载 ProgressBar 加载与隐藏

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