Android 自定义通用的loadingview实现代码

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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