一个小技巧避免AlertDialog 窗体泄露

一个小技巧避免AlertDialog 窗体泄露

package acr.browser.lightning.utils;

import android.content.Context;
import android.util.Log;

import androidx.activity.ComponentActivity;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.lifecycle.DefaultLifecycleObserver;
import androidx.lifecycle.LifecycleOwner;

import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class LeakAlertDialogBuilder extends AlertDialog.Builder implements DefaultLifecycleObserver {

    private static final String TAG = "my_alert_dialog_builder";
    private final List<WeakReference<AlertDialog>> weakReferenceList=new ArrayList<>();

    public LeakAlertDialogBuilder(@NonNull Context context) {
        super(context);
        init(context);
    }

    public LeakAlertDialogBuilder(@NonNull Context context, int themeResId) {
        super(context, themeResId);
        init(context);
    }

    private void init(Context context) {
        if (context instanceof ComponentActivity){
            ((ComponentActivity) context).getLifecycle().addObserver(this);
            Log.i(TAG, "init: register life cycle:"+context);
        }
    }

    @NonNull
    @Override
    public AlertDialog create() {
        AlertDialog alertDialog = super.create();
        weakReferenceList.add(new WeakReference<>(alertDialog));
        return alertDialog;
    }

    @Override
    public void onPause(@NonNull LifecycleOwner owner) {
        DefaultLifecycleObserver.super.onPause(owner);
        releaseAlertDialog();
    }

    private void releaseAlertDialog() {
        Iterator<WeakReference<AlertDialog>> iterator = weakReferenceList.iterator();
        while (iterator.hasNext()){
            WeakReference<AlertDialog> item = iterator.next();
            AlertDialog alertDialog = item.get();
            if (alertDialog!=null){
                if (alertDialog.isShowing()){
                    alertDialog.cancel();
                    Log.i(TAG, "onPause: cancel dialog:"+alertDialog);
                }
            }else {
                item.clear();
                iterator.remove();
                Log.i(TAG, "onPause: clear item:"+item);
            }
        }
    }

}

还可以做个类似的类，可以只替换import就能够使用。

package acr.browser.lightning.utils;

import android.content.Context;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

public class AlertDialog extends androidx.appcompat.app.AlertDialog {
    protected AlertDialog(@NonNull Context context) {
        super(context);
    }

    protected AlertDialog(@NonNull Context context, int themeResId) {
        super(context, themeResId);
    }

    protected AlertDialog(@NonNull Context context, boolean cancelable, @Nullable OnCancelListener cancelListener) {
        super(context, cancelable, cancelListener);
    }

    public static class Builder extends LeakAlertDialogBuilder {

        public Builder(@NonNull Context context) {
            super(context);
        }

        public Builder(@NonNull Context context, int themeResId) {
            super(context, themeResId);
        }
    }
}