使用透明 Activity 作为 Dialog 的 Context 的封装方法

DialogContainerActivity.java

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

/**
 * Created by twiceYuan on 10/8/15.
 *
 * 因为 Dialog 需要作为 Activity 作为 Context，所以在服务中如果需要弹出对话框就需要该界面支持
 */
public class DialogContainerActivity extends Activity {

    private static DialogContextProvider mContextProvider;

    public static void show(DialogContextProvider contextProvider) {
        mContextProvider = contextProvider;
        Intent intent = new Intent(App.getApp(), DialogContainerActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        App.getApp().startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContextProvider.getActivity(this);
    }

    public interface DialogContextProvider {
        void getActivity(Activity activity);
    }
}

Usage.java

/**
 * 没有 Activity 的 Context 时调用的(注意: 在 Activity 中调用会触发原 Activity 的 onPause)
 */
public static void simpleMessage(String message, OnConfirm onConfirm, OnCancel onCancel) {
    DialogContainerActivity.show(context -> {
        AlertDialog.Builder builder = new AlertDialog.Builder(context, R.style.AppTheme_Dialog);
        builder.setMessage(message);
        if (onConfirm != null) {
            builder.setPositiveButton("确定", (dialog, which) -> onConfirm.onConfirm());
        }
        if (onCancel != null) {
            builder.setNegativeButton("取消", (dialog, which) -> onCancel.cancel());
        }
        AlertDialog dialog = builder.create();
        dialog.show();
        closeDialogContainer(dialog, context);
    });
}

/**
 * 关闭对话框外部的 Activity
 */
private static void closeDialogContainer(AlertDialog dialog, Activity context) {
    dialog.setOnDismissListener(d -> context.finish());
}

/**
 * 确定回调接口
 */
public interface OnConfirm {
    void onConfirm();
}

/**
 * 取消回调接口
 */
public interface OnCancel {
    void cancel();
}