介绍

好久没有写博客啦，最近在接近新年了，年前的工作都要收尾，所以特别忙，周末抽空写了个通用的加载view,写篇博客分享出来。

功能

1、显示加载视图，加载失败的时候显示加载失败视图，数据为空时显示数据为空视图，支持为失败视图设置点击事件重新加载数据。

2、支持个性化设置，自定义设置 加载、失败、空数据视图。

先放一张效果图压压惊

实现

实现思路其实就是一个FrameLayout里添加三个布局做处理显示隐藏，自定义视图其实就是替换里面的view ,代码比较简单，如果直接看过我的自定义view系列文章，或者对自定义view有所了解，都很容易看懂，所有直接上代码了。

具体代码

java 代码

public class CommonLoadingView extends FrameLayout {


    //加载时显示文字
    protected TextView mLoadingTextTv;
    public Context mContext;
    //加载错误视图
    protected LinearLayout mLoadErrorLl;
    //加载错误点击事件处理
    private LoadingHandler mLoadingHandler;
    //加载view
    private View loadingView;
    //加载失败view
    private View loadingErrorView;
    //数据为空
    private View emptyView;


    public CommonLoadingView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CommonLoadingView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context;
    }

    public void setLoadingHandler(LoadingHandler loadingHandler) {
        mLoadingHandler = loadingHandler;
    }

    public void setLoadingErrorView(View loadingErrorView) {
        this.removeViewAt(1);
        this.loadingErrorView = loadingErrorView;
        this.loadingErrorView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mLoadingHandler != null) {
                    mLoadingHandler.doRequestData();
                    CommonLoadingView.this.load();
                }
            }
        });
        this.addView(loadingErrorView,1);
    }

    public void setLoadingView(View loadingView) {
        this.removeViewAt(0);
        this.loadingView = loadingView;
        this.addView(loadingView,0);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        loadingView = inflate(mContext, R.layout.common_loading_view, null);
        loadingErrorView = inflate(mContext, R.layout.network_layout, null);
        emptyView = inflate(mContext, R.layout.empty_layout, null);
        this.addView(loadingView);
        this.addView(loadingErrorView);
        this.addView(emptyView);
        loadingErrorView.setVisibility(GONE);
        emptyView.setVisibility(GONE);
        initView(this);
    }


    public void setMessage(String message) {
        mLoadingTextTv.setText(message);
    }


    private void initView(View rootView) {
        mLoadingTextTv = (TextView) rootView.findViewById(R.id.loading_text_tv);
        mLoadErrorLl = (LinearLayout) rootView.findViewById(R.id.load_error_ll);
        mLoadErrorLl.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mLoadingHandler != null) {
                    CommonLoadingView.this.load();
                    mLoadingHandler.doRequestData();
                }
            }
        });
    }

    public void load(){
        loadingView.setVisibility(VISIBLE);
        loadingErrorView.setVisibility(GONE);
        emptyView.setVisibility(GONE);
    }

    public void load(String message){
        mLoadingTextTv.setText(message);
        loadingView.setVisibility(VISIBLE);
        loadingErrorView.setVisibility(GONE);
        emptyView.setVisibility(GONE);
    }


    public void loadSuccess(){
        this.loadSuccess(false);
    }

    public void loadSuccess(boolean isEmpty){
        loadingView.setVisibility(GONE);
        loadingErrorView.setVisibility(GONE);
        if (isEmpty) {
            emptyView.setVisibility(VISIBLE);
        }else{
            emptyView.setVisibility(GONE);
        }
    }


    public void loadError(){
        loadingView.setVisibility(GONE);
        loadingErrorView.setVisibility(VISIBLE);
    }


    public interface LoadingHandler{
        void doRequestData();
    }
}

使用

基本使用

几个基本的 load loadError loadSucccess方法的使用。

public class DefaultViewActivity extends AppCompatActivity {

    protected ListView mListView;
    protected CommonLoadingView mLoadingView;
    private List<String> mList = new ArrayList<>();
    ArrayAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.setContentView(R.layout.activity_default_view);
        initView();
    }

    private void initView() {
        mListView = (ListView) findViewById(R.id.listView);
        mLoadingView = (CommonLoadingView) findViewById(R.id.loadingView);
        mLoadingView.load();

        //设置点击错误视图重新加载事件
        mLoadingView.setLoadingHandler(new CommonLoadingView.LoadingHandler() {
            @Override
            public void doRequestData() {
                mLoadingView.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        for (int i = 1; i <=20 ; i++) {
                            mList.add(i+"");
                        }
                        adapter = new ArrayAdapter(DefaultViewActivity.this, android.R.layout.simple_list_item_1, android.R.id.text1, mList);
                        mListView.setAdapter(adapter);
                        mLoadingView.loadSuccess(false);
                    }
                },2500);
            }
        });

        //模拟网络错误，加载失败
        mLoadingView.postDelayed(new Runnable() {
            @Override
            public void run() {
                mLoadingView.loadError();
            }
        },2500);


    }
}

自定义视图 使用

只需要把自己自定义的view调用set方法设置进去即可。

this.mLoadingView.setLoadingView(loadingView);
    this.mLoadingView.setLoadingErrorView(loadingErrorView);

public class CustomViewActivity extends AppCompatActivity {

    protected ListView mListView;
    protected CommonLoadingView mLoadingView;
    private List<String> mList = new ArrayList<>();
    ArrayAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.setContentView(R.layout.activity_default_view);
        initView();
    }

    private void initView() {
        mListView = (ListView) findViewById(R.id.listView);
        mLoadingView = (CommonLoadingView) findViewById(R.id.loadingView);


        //设置自定义视图
        ProgressBar progressBar = new ProgressBar(this);
        this.mLoadingView.setLoadingView(progressBar);
        TextView textView = new TextView(this);
        textView.setText("加载失败...");
        this.mLoadingView.setLoadingErrorView(textView);

        mLoadingView.load();

        //设置点击错误视图重新加载事件
        mLoadingView.setLoadingHandler(new CommonLoadingView.LoadingHandler() {
            @Override
            public void doRequestData() {
                mLoadingView.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        for (int i = 1; i <=20 ; i++) {
                            mList.add(i+"");
                        }
                        adapter = new ArrayAdapter(CustomViewActivity.this, android.R.layout.simple_list_item_1, android.R.id.text1, mList);
                        mListView.setAdapter(adapter);
                        mLoadingView.loadSuccess(false);
                    }
                },2500);
            }
        });

        //模拟网络错误，加载失败
        mLoadingView.postDelayed(new Runnable() {
            @Override
            public void run() {
                mLoadingView.loadError();
            }
        },2500);
    }
}

至于具体的布局和样式文件就不贴了，主要是实现思路，代码

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