【Android】全局加载提示

描述

类似IOS的圆角加载对话框

实现

SuperRoundLadingDialogFragment

import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.TextView;


import com.example.testandroid.R;
import com.example.testandroid.fragment.BaseDialogFragment;


/**
 * 类似IOS的圆角加载对话框
 * <p>
 * 基于此框架进行修改：https://github.com/ydstar/loadingdialog
 */
public class SuperRoundLadingDialogFragment extends BaseDialogFragment implements DialogInterface.OnKeyListener {

    private TextView messageView;

    @Override
    protected void initDatum() {
        super.initDatum();
        String message = getArguments().getString("SuperRoundLadingDialogFragment");
        if (message == null){
            message = getString(R.string.loading);
        }
        messageView.setText(message);
    }

    public static SuperRoundLadingDialogFragment newInstance(String message) {

        Bundle args = new Bundle();
        args.putString("SuperRoundLadingDialogFragment",message);

        SuperRoundLadingDialogFragment fragment = new SuperRoundLadingDialogFragment();
        fragment.setArguments(args);
        return fragment;
    }
    public static SuperRoundLadingDialogFragment newInstance() {

        Bundle args = new Bundle();

        SuperRoundLadingDialogFragment fragment = new SuperRoundLadingDialogFragment();
        fragment.setArguments(args);
        return fragment;
    }
    @Override
    protected View getLayoutView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Dialog dialog = getDialog();
        //设置背景透明
        dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);

        //去掉标题
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        dialog.setCanceledOnTouchOutside(false);

        View view = inflater.inflate(R.layout.super_round_dialog_loading, container);
        messageView = view.findViewById(R.id.message);

        //不响应返回键
        dialog.setOnKeyListener(this);

        return view;
    }

    @Override
    public boolean onKey(DialogInterface dialogInterface, int keyCode, KeyEvent keyEvent) {
        return keyEvent.KEYCODE_BACK == keyCode ? true : false;
    }
}

R.layout.super_round_dialog_loading

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="120dp"
        android:background="@drawable/shape_round_dialog_background"
        android:gravity="center"
        android:minWidth="120dp"
        android:orientation="vertical"
        android:paddingHorizontal="20dp"
        android:paddingVertical="15dp">

        <ProgressBar
            android:id="@+id/progressBar"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:indeterminateBehavior="repeat"
            android:indeterminateDrawable="@drawable/anim_super_loading_icon" />

        <TextView
            android:id="@+id/message"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/padding_meddle"
            android:textColor="@color/white"
            tools:text="login login login" />
    </LinearLayout>
</LinearLayout>

黑色圆弧背景

@drawable/shape_round_dialog_background

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <solid android:color="#88000000" />

    <corners android:radius="10dp" />
</shape>

ProgressBar 动画

@drawable/anim_super_loading_icon

<?xml version="1.0" encoding="utf-8"?>
<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/super_loading"
    android:fromDegrees="0.0"
    android:pivotX="50.0%"
    android:pivotY="50.0%"
    android:toDegrees="-360.0" />

@drawable/super_loading

封装

BaseLogicActivity

/**
 * 本项目APP的通用逻辑
 */
public class BaseLogicActivity extends BaseCommonActivity{
    
    private WeakReference<SuperRoundLoadingDialogFragment> loadingWeakReference;

	......

    //加载框

    /**
     * 显示加载对话框
     */
    public void showLoading() {
        showLoading(getString(R.string.loading));
    }

    /**
     * 显示加载对话框
     */
    public void showLoading(int data) {
        showLoading(getString(data));
    }

    /**
     * 显示加载对话框
     */
    public void showLoading(String message) {
        //避免发生内存泄露
        if (loadingWeakReference == null || loadingWeakReference.get() == null) {
            loadingWeakReference = new WeakReference<>(
                    SuperRoundLoadingDialogFragment.newInstance(message)
            );
        }
        SuperRoundLoadingDialogFragment dialog = loadingWeakReference.get();
        //避免多次展示
        if (dialog.getDialog() == null || !dialog.getDialog().isShowing()) {
            dialog.show(getSupportFragmentManager(), "SuperRoundLoadingDialogFragment");
        }


    }

    /**
     * 隐藏加载对话框
     */
    public void hideLoading() {
        SuperRoundLoadingDialogFragment dialog = loadingWeakReference.get();
        if (dialog != null) {
            dialog.dismiss();
            loadingWeakReference.clear();
        }
        loadingWeakReference = null;
    }
}

这里用到了Java的弱引用来避免内存泄露。

就是加载对话框会持有本Activity，然后他们都去后台之后，本来Activity是应该释放的。

但是因为loading fragment 的持有就释放不了。

就会导致内存卸扣。

解决办法就是用：弱引用。

这个就会在activity在后台时候，下一次垃圾挥手就会回收。

总结

经此一封装，后面想显示加载对话开给你就只用：

showLoading("what you wanner say");